An Economy Has Full-Employment Output of 5000

An economy has full-employment output of 5000.Government purchases are 1000.Desired consumption and desired investment are given by C^d = 3000 - 2000r + 0.10Y
I^d = 1000 - 4000r
Where Y is output and r is the real interest rate.The real interest rate that clears the goods market is equal to

A) 1) 25%.
B) 2) 50%.
C) 8) 33%.
D) 25.00%.