To calculate interest by the preceding table. RULE. Multiply the sum by the rate per cent. and that product by the months, weeks or days given; then cut off the two last figures to the right hand, and enter the table with what re. mains to the left; against which numbers, collected, is the interest for the given sum. Note. For every 10 cut off in in months, add ad. for every 30 in weeks, add id. and for every 40'in days, add iqr. 1 What is the interest of 24661 ios 6d. for 10 months, at 4 per cent. per annum ? .d. 2466 16 6 900-750 4 4 6 9867 6 o Add "I 21 do 80= 6 13 IO 4. 82' 4 61 answer. 986173 0 2 What is the interest of 24671 10$. for 12 weeks, at 5 per cent. per annum ? L. d. 1000=194 71 .. 400= 713 10 2467 10X 5x12=1480150 80 I 10 9 Add 21 $. answer. 281 gs 5d, 3 What is the interest of 24677 10s. for 50 days, at 6 per cept. per annum? L. d 7000-19 3 6 L, 400= 1 I 11 2467 10X6X 50=7402150 Add S. ans. 20157d. To find what any estate from :/. to 50000l. per annum will be for a month, or a day; RULE. RULE. Collect the sums from the table opposite the given numbers for the answer. EXAMPLE S. At 365l. per annum, what is that per day, also per month? d. d. 300=16 51 .25 60= 3 31 5 31 8 4 LI o per day: b. 30 8:4 per month. To find the amount of any income, salary or servant's : wages, for any number of months, weeks or days; RULE. Multiply the yearly income, or salary, by the number of months, weeks or days, and collect as before from the table. EX A M P L E. What will 270l. per annum come to for 11 months, for 3 weeks, and for '6 days, separately and collectively? d. 160 14 4 270XII=2970 { A TABLE Of Days for any given time less than a Year. Days. 6th. Mon. 7th. Mon. 80 11 1 3260 91 121|152182 213 244 274 305 335 2 233/61 92/122 153 183214245 275 306 336 3 334.62 93|123|154184215 246 2761307|337 4. 4|3563 94 124 155 185 216 247 277|308 338 5 5 36/64 95 125 156186 217 248 278 309 339 6 6 3765 96126 157 187 218 249 279 310 340 7 73866 97127 158 188 219 250 280 311 341 8 8|39|67|98|128 159 189 220 251 281 312 342 9 9 4068 99 129 160 190 2211252282 313 343 10 10 4169 100/130/161191222253283314 344 11|11|42|70101131 162 192223254284 315 345 12124371|1021321163193 224 255 285 316346 1313 4472103/133164194 225 256 286 317 347 14 14 4573104134 165 195 226 257 287 318 348 15/154674105 135 166 196/227 258 288 319 349 16 16/4775106136/167 197|228 259 289 320 350 17 17 48176 107 137 168/198|229 260 290 321 351 1818|49|77 108 138/169|199 230 261 291 322 352 19195078 109/139170 200 231 2621292 323 353 20 20 5179110 140 171 201 232 263 293 324 354 21 21 521801111411172202233264294 325 355 22225381 112 142 173 203 234 265 295 326 356 232354 821 13143174204 235 266 296 327 357 2424/55 831141144 175 205 236 267 297 328 358 25 2556 84 115 145 176 206 237 268|298 329 359 26 26 57 85 116146|177 207 238 269 299 330 360 27 27 58 86 117 147 1782081239/270/300 331 361 28 28 5987 1 18148 179 209 240271 301 332 362 29 29 6088 119 149|180 210 241 272 302 533363 S0/301 189 120150181 211'242/27 3303 334 364 31131) 90) (151 212 243 |304) 365 I THE USE OF THE TABLE. First, To know the number of days, from the beginning of the year, to any given day of any month : This is obtained by inspection only. Secondly, To find the number of days from any day in any month to the end of the year. Suppose from 10th 9mo. From 365 Take the days answering to 10th Omo. . 253 Remains Days 112 Thirdly, To find the number of days between different dates. Suppose the 9th of the 5th month, and the 5th of the kith month. From the number answering to 5th 11mo. 309 129 Days 180 Fourthly, To find the number of days from a given date, to some other in the year following: Suppose from 12th 10mo. to 10th 6mo. ensuing. From 365 Take the number answering to 12th 10mo. 285 80 161 To which add the 10th 6mo. Days required 241 Note. If the intercalary day of a leap year intervene, one day must be added to those found as before. COMPOUND INTEREST. Compound interest is that which arises from a principal increased by its interest as the interest becomes due. RULE. Find the first year's amount by simple interest, which will be the principal for the second year; and the amor nt of this will be the principal for the third year, &c. From the last amount, take the given principal, and the remainder will be the compound interest. EXAMPLES. 1 What is the compound interest of 450l. for three years, at 5 per cent. per annum ? £ s. d. 450 0 0 Interest=zo Amount 1st year 472 10 23 12 6 496 - 2 6 Interest=26= 24 16 11 Amount 3d year 520 18 71 를 Principal 450 answer £.70 18 71 cent. per annum? answer 5041. 195. 9d. 3 How much is the compound interest of 1280 dols. for six years, at 5 per cent. per annum ? answer 435,32,2 mills. 4. What will 5001. amount to in 4 years, at 41 per cent. answer 5901. 11s. 5d.; 5 What is the compound interest of 4001, 10s, at 31 per cent. per annum, for three years ? answer 431. 1os. 9d. per annum? REBATE, or DISCOUNT. R EBATE, or Discount, is an abatement for the paya ment of money before due, by accepting so much, as would amount to the whole debt at the time payable, at a given rate, RULE |
