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25 percent increase.
To calculate the percent increase, you first need to find the difference between the new value and the original value. In this case, 7200 increases by 1800 to become 9000. The difference is 1800. To find the percent increase, divide the difference (1800) by the original value (7200), then multiply by 100. So, (1800/7200) * 100 = 25%. Therefore, the percent increase when 7200 increases by 1800 is 25%.
The increase is 32 percent. (8/25)
25.
25% increase