If 18 binders bind 900 books in 10  days, how, many binders will be required  to bind .660 books in 12 days?

1) 22

2) 14

3) 13

4) 11

The simple interest accured on a sum of money at the end of four years is 1/5  th of its principal. What is the rate of interest per annum?

1)4%

2) 5%

3) 6%

4)Data Inadequate