∫ The central angle of the sector where the first prize is located is 45+45 2 = 32× 45.

The first prize, the second prize and the third prize * * * occupy 360 degrees, and the first prize will be won with a 10% discount.

∴ The probability of getting a discount of 10% for one turn of the turntable =32×? 45 360 =3 16,

So choose C.