Write a C program that finds the weighted average and letter grade corresponding to the student's year-end weighted average, taking into account the grades and credits of 3 courses a student takes in the semester. (40 + 10p)

A course grade X Credits + B grade grade X credits + C grade grade X credits Year-end weighted average / Total Credit = Weighted Average Letter Grade at the End of the Year Below

50 (not including 50) ---F

50 to 70 (not including 70) ---C

70 to 85 (not including 85)--- B

85 or above--- A