A person borrows Rs 4000 from a bank at 7 ½% per annum compound interest, compounded annually. At the end of every year, he pays Rs 1500 as part of the repayment of loan & interest. How much does he still owe to the bank after 3 such installments?

Two wrist watches were sold for Rs. 1,980 each. One wrist watch was sold at a profit of 10% and the other one at a loss of 10%, The entire transaction resulted in: a) Loss/Profit % equal to ____ b) Loss/Profit amounting to____

From a point P on the ground, the angle of elevation of the top of a 10m tall building is 30°. A flag is hoisted at the top of the building and the angle of elevation of the top of the flagstaff from P is 45°. Find the length of the flagstaff (Take √3 = 1.732)

A, B, and C can complete a work in 40, 60, and 80 days respectively. They started working together. If A and B left 11 days and 8 days before the completion of work. In how many days they will complete the work.