Question 255394
10x+8(500-x)=500*9.50
10x+4,000-8x=4,750
2x=4,750-4,000
2x=750
x=750/2
x=375 $10 tapes were sold
500-375=125 $8 tapes were sold.
Proof:
10*375+8*125=4,750
3,750+1,000=4,750
4,750=4.750