a.) An amount of P14,000 is borrowed at a discount rate of 10%, find the proceeds if the length of the loan in 180 days b.) A deposit of P1500 is made into a fund on March 18. The fund earns simple...

a.) An amount of P14,000 is borrowed at a discount rate of 10%, find the proceeds if the length of the loan in 180 days
b.) A deposit of P1500 is made into a fund on March 18. The fund earns simple interest at 5%. On August 5, the interest rate changed to 4.5%. How much is in the fund on October 23?
c.) How long will it take any sum to double itself with an 11 percent simple interest?