The rate at which a sum becomes four times of itself in 15 years at S.I., will be (a) 15% (b) `17 1/2%` (c) 20% (d) 25%

The rate at which a sum becomes four xx of itself in 15 years at S.I.,will be (a) 15% (b) 17(1)/(2)% (c) 20% (d) 25%

In what time will a sum of money double itself at 15% per annum?

At simple interest a sum becomes (49)/(40) of itself in 2 1/2 years. The rate of interest per annum is (a) 7% (b) 8% (c) 12% (d) 9%

In how many years will a certain sum become 3 times itself at 25% per annum under simple interest? (a) 5 (b) 8 (c) 12 (d) 6

In what time does a sum of money becomes 4 times of itself at simple interest rate of 15% per annum .

At what rate percent per annum simple interest will a sum double itself in 10 years? (a) 8% (b) 10% (c) 12% (d) 12 1/2%

In how many years will a certain sum becomes five times itself at 20% per annum simple interest?

In a school, 50% students play cricket and 40% play football. If 10% of students play both the games, then what percent of students play neither cricket nor football? (a) 10% (b) 15% (c) 20% (d) 25%