Elementary arithmetic, with brief notices of its history... by Robert Potts.

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11. If the principal sum with interest at the rate of 5 in the 10I
for a month amount in a year to 1000; tell the principal and interest
respectively (Lilavati).
12. Find the discount on ~170. 18s. 5d. due 52 days hence, at 2 —d.
per ~100 per cay.
13. If ~10 be the interest of ~110 for a given time, what should
be the discount of ~110 for the same time?
14. Shew that the interest on the discount of ~100 for one year at
5 per cent. per annum is equal to the discount on the interest at the
same rate for the same time.
VII.
1. Find the amount of ~320. 10s. for 4 years, at 5 per cent. compound interest, when the interest is payable yearly and half-yearly.
2. Find the amount of ~819. 4s. in 6 years at ~12. 10s. per cent.
per annum compound interest.
3. Find the amount of ~62. 10s. in four years at 20 per cent. per
annum compound interest.
4. What sum must be paid down to receive ~600 at the end of three
years, allowing 5 per cent. per annum compound interest?
5. Finc the compouncl interest of ~250 at 3 per cent. per annum
for 2 years and 195 days.
6. What is the compound interest of ~410 forthe term of 21- years
at 41- per cent. per annuti, the interest payable quarterly?
7. The difference between the compound and simple interest of a
certain sum of money for 3 years at 4 per cent. is 19s. Find the sum.
8. Find at what rate of simple interest in two years a sum would
amount to the same sum as at 4 per cent. compound interest.
9. Compare the simple and compound interest of ~350 for 4 years
at 43 per cent. per annum.
10. In how many years will ~1000 amount to ~1123. 12s. at 6
per cent. per annum compound interest?
11. A person put out to interest ~2,000 at 4 per cent.; he spends
annually ~75, and adds the remainder of his dividend to his stock.
What is he worth at the end of 5 years?
12. What sum of money put out to compound interest for 5 years.
at 5 per cent. per annum will amount to ~100?
13. What is the present value of the compound interest, 3 per
cent. per annum, of ~100, to be received five years hence?
14. Find the whole amount and the interest accumulated at the end
of 4 years, by one who invests ~200 at the beginning of each year at
33 compound interest.
15. If a legacy of ~500 be left to a youth of 15 years of age, and
invested at 4 per cent. per annum compound interest; what sum
vould he receive when he becomes of age?
16. A person saves from his income ~100 a year, and invests his