Interest Rate Risk Estimation

I continue to get -3.7% (-7.4 * .5) and $48.30 for Question 1 and 2. What am I doing wrong?

QUESTION 1 A bond has a $1,000 par value, 4% coupon paid annually, 3.5% YTM, 15 years to maturity, and a modified duration of 7.4. Use the interest rate risk estimation formula to estimate interest rate risk for this bond in response to a 50 basis point decrease in its yield to maturity. If the answer is negative, also type in the minus sign QUESTION 2 A bond has a $1,000 par value, 6% coupon paid annually, 6.25% YTM, 12 years to maturity, and a modified duration of 5, Estimate the price change for this bond if its yield to maturity increases by 25 basis points. If the answer is negative, also type in the minus sign