1 An engineer promised to pay P36,000 at the end of 90days. He was offered a 10% discount if he pays in 30 days. Find the rate of interest.

2 A man is required to pay P200 at the end of 160 days or P190 at the end of 40 days. Determine the rate of interest.

3Compute the discount if P2000 is discounted for 6 months at 8% simple interest.