18. [-/5 Points] DETAILS TANAPMATH7 4.1.010. Determine the simple interest rate at which $1200 will grow to $1257 in 6 months. (Round your answer to two decimal places.) 9.50 %/year Viewing Saved Work Revert to Last Response 19. [-/5 Points] DETAILS TANAPMATH7 4.3.042.EP. MY NOTES ASK YOUR TEACHER MY NOTES ASK YOUR TEACHER Sarah secured a bank loan of $155,000 for the purchase of a house. The mortgage is to be amortized through monthly payments for a term of 15 years, with an interest rate of 3%/year compounded monthly on the unpaid balance. Determine Sarah's monthly payment, in dollars. (Round your answer to the nearest cent.) She plans to sell her house in 5 years. How many payments have been made at that point? payments How much (in dollars) will Sarah still owe on the house? (Round your answer to the nearest cent.) $