We have:
Face value FV = $1000
Coupon payment Pmt = 1000 x 6.20%/2 = 31
N = 6x2 = 12
R = 15%/2
We can use following formula to calculate the price of this bond:
PV = Pmt x PVIFA(N,R) + FV x PVIF(n, R)
= 31 x PVIFA(12,7.50%) + 1000 x PVIF(12,7.50%)
= 31 x 7.73528 + 1000 x 0.41985
= $659.64
Therefore, the price of this bond would be $649.64.