The present value of perpetuity paying 15 at the end of every 4 year

Please solve by hand writing. thank you

Question 7.07 The present value of a perpetuity paying 15 at the end of every 4-year period, with the first payment made at the end of year 4 , is 37.50. Using the same annual effective interest rate, find the present value of a perpetuity paying 1 at the end of each 4-month period, with the first payment made at the end of 4 months. A 30.98 B 35.17 C 36.17 D 41.47 E 47.05