Q7. A sum was lent to X for three years by an organisation who fixed a yearly rate of 10%
compound Interest for repayment along with the condition of recovery in equal installments of
Rs.31944. What percentage (correct to two decimal places) above the borrowed amount had X
to pay the organization?
Q9. The Table below presents the percentage marks obtained by three students A, Y, Z in the
four components of assessment, A, B, C, D of a paper whose respective weightages are 4, 3, 2,
What is the ratio of the average percentage of X in A, B to that of Y, Z combined in C, D?
Q10. A city water supply tank has two inlet pipes X and Y, which can fill it in 20 and 30 hours
respectively, and an outlet pipe Z which can empty a full tank in 40 hours. If the tank is empty
and the taps are opened in succession for one hour each, and the process continues, in how
many hours will the tank get filled?
A. 49 1/4
B. 51 3/7
C. 49 ½
D. 49 1/7