Hello erudite nairalanders,
pls help solve the following interview mathematics questions given by a multi national company in Benin.
They are multiple choice questions but a detailed breakdown on how the answer was gotten is mostly needed.

1. James deposited #800.00 in the bank at the rate of 12.5% simple interest. After some time, the total amount was one and half times the principal. For how many years was the money left in the bank?
A. 2 B. 4 C. 5.5 D. 8

2. If a circular paper disc is trimmed in such a way that its circumference is reduced in the ratio 2:5, n what ratio is the surface area reduced.
A. 8:125 B. 2:5 C. 8:25 D. 4:25

3. A man reduced the quantity of food bought for the family by 10% when he found that the cost of living had increased by 15%. The fractional increase in the family food bill is now:
A. 1/12 B. 6/25 C. 7/200 D. 19/300

4. Find a two-digit number such that three times the tens digit is 2 less than twice the units digit, and twice the number is 20 greater than the number obtained by reversing digits.
A. 47 B. 24 C. 42 D. 72

6. If Oge scored 75 in Biology instead of 57 her average mark in four subjects would have been 60. What was her total mark?
A. 282 B. 222 C. 240 D.210

solve and comment ur state of residence

any financial incentive involved?