Answer: 5.56%
Explanation:
Deduct the original price from the price that reflects the increase to get the increment.
R13 28-R 12,58 = R, 70
Place the increase on the original price and multiply by 100%
R, 70/R 12,58 x 100/1
Percentage increase = 5.56%
To check, calculate 5.56%o of 12,58 and add to 12,58, you will get R13,28