11. A credit union entered a lease contract valued at $7800. The contract provides for payments at the end of each quarter for 4 years. If interest is 4.5% compounded quarterly, what is the size of the quarterly payment?

The payment is $______.

(Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)

12. Jie purchased a computer priced at $1108.43, financing it by paying $68.45 on the date of purchase, and signing a contract to pay equal monthly payments over the next eighteen months. If the terms of the contract state that interest is calculated at 11.4% compounded monthly, how much does Jie have to pay at the end of each month?

Jie must make payments of $______.

(Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)