Ok, so I have a serious problem when I was calculating the PV (present value) on my financial calculator. It was supposed to be $845.87, but my calculator keeps showing -2,175.94 and that's wrong. Could you please help me with this problem?

Question 9 1 pts A corporate bond with a 6% coupon (paid semiannually) has a yield to maturity of 7.5%. The bond matures in 20 years but is callable at $1050 in ten years. The maturity value is par. Calculate the bond's yield to call. % terms w/o $ sign. (HINT: Find the current price and then solve for YTC.)