please help

1. Find the interest and the final amount of 5,000 principal at 3.5% simple interest for 3 years

2.Francisco earn 525 pesos after 3 years from deposit at 3.5% simple interest. Find the principal amount deposited.

3.If Francisco deposit a 112,000 pesos earns an interest

67,760 pesos at the end of 5 years and 6 months, at what interest rate was it invested?