If the difference between the simple interest and

9) If the difference between the simple interest and compound interests on
some principal amount at 20% for 3 years is Rs. 48, then the principal
amount is
a) Rs. 365 b) Rs. 325 c) Rs. 395 d) Rs. 375
10) Andrews earns an interest of Rs. 1596 for the third year and Rs. 1400 for
the second year on the same sum. Find the rate of interest if it is lent at
compound interest.
11) The population of a town is 40,000. It decreases by 20 per thousand per
year. Find out the population after 2 years.
a)38484 b)38266 c)38416 d)38226
12) The compound interest on a sum for 2 years is Rs. 832 and the simple
interest on the same sum for the same period is Rs. 800. The difference
between the compound and simple interest for 3 years will be
13) John invested money in two schemes A and B offering compound interest
@ 5 p.c.p.a. and 10 p.c.p.a. respectively. If the total amount of interest
accrued through two schemes together in two years was Rs. 2075 and the
total amount invested was Rs. 15,000, find out the amount invested in
Scheme A?