For bonds, assume coupons paid semi-annually, coupon rates and yields quoted with semi-annual compounding, and redeemable at par unless otherwise noted (Ignore it if it's not relevant to the question).

A municipality issues a $100 par value bond paying a 5% coupon with 15 year maturity. The bond is callable in 10 years (after the 20th coupon payment) at a call price of 105. If the yield rate is 4%, how much should investors pay for the bond? (Hint: check to see if it is worth it for the borrower to call, first)