Find the percent of change. then state whether it is an increase or decrease. from 45 days to 30 days

(Final-initial)/Initial
(30-45)/45 = -15/45 = -1/3
This results in a -33 1/3% decrease.

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If you would like to find the percent of change, you can calculate this using the following steps:

x% of 45 = 30
x/100 * 45 = 30    /*100/45
x = 30 * 100 / 45
x = 200/3
x = 66.67%

100% - 66.67% = 33.33%

Result: It is a 33.33% decrease.