I need help with these simple interest questions

At what rate of interest must a principal of $1545 be invested to earn interest of $58.93 in 150 days? The required interest rate is -|%. (Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.)Determine the present value of a debt of $12,000 due in seven months if interest at 6-% is allowed. The present value is $ - (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)On October 15, 2017, Toys Or More borrowed money with a promise to pay $23,470.97 on June 12, 2018. This loan included interest at 6.4%. How much money did Toys Or More borrow on October 15, 2017? Toys Or More borrowed $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)