Your local coffee shop has announced new hours of operation. previously: 7 am – 4 pm monday thru friday and 7am to noon saturday and sunday the new hours will be: 7am to 7pm monday thru friday and 7am -4 pm saturday and sunday a) what is the increase in total hours opened? b) assuming the hourly wage will stay the same (weekly original payroll $ 385.) what will be the total weekly pay under the new hours? c) what is the percentage increase in total pay?

Part (a)
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See the attached figure which represents the problem.
So, we can note that there are 3 hours increase from Monday thru Friday

and 4 hours increase in both of Saturday and Sunday

So, the increase in total hours opened = 3*5 + 4*2 = 23 hours

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Part (b):

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weekly original payroll $ 385

Total working of old hours = 9 * 5 + 5 * 2 = 55 hours
so, the hourly payroll = 385/55 = $ 7 
Assume the hourly wage will stay the same

Total working of new hours = 55 + 23 = 78 hours

So, the total weekly pay under the new hours = 78 * 7 = $ 546

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Part (c):
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The total pay for old hours = $ 385
The total pay for new hours = $ 546
The increase in the total pay = 546 - 385 = $ 161

The percentage increase in total pay =