Answer: 30%
Explanation:
First, calculate the difference between the original number and the new number:
1.30 - 1.00 = 0.30
Second, divide the difference by the original number.
0.30/1.00 = 0.3
Third, multiply the answer by 100 to get the percentage. (Remember cent means 100!)
0.3 * 100 = 30
Therefore, the profit per cent was 30%.
Hoped this helped!