Answer:
54%
Explanation:
Percent increase = (new - original)/ original * 100%
The new cost is 800 and the original cost is 520
Percent increase = (800-520)/520 *100%
= 280/520 * 100%
.538461538 * 100%
53.8461538 %
Give the answer to 2 significant figures, means we round to the ones place
54 %