Question 1057299
If you get 20% off it means that instead of paying 100% you are paying 100-20 = 80%. As you know, 80 percent literally means 80 out of 100 (that's the % sign). So if you want to apply it to one you have to divide by 100. Thus, for calculations purposes we use 0.80 (80/100).
:
C = 79+[(46.99*0.80)x]
for 10 boxes:
79+[(46.99*0.80)10] = your answer. Use your calculator