Using an equation: Pricezerocoupon = Face Value × [ 1 / ( 1 + i/n)n × 2]
Here, Pricezerocoupon = 1000 × [ 1 / (1+ 0.075/2)12 × 2] = 1000 × 0.41332 = 413.32.
Using the calculator: N = (12 × 2) = 24, I/Y = 7.50 / 2 = 3.75, FV = 1000, PMT = 0. PV = -413.32
