The price of the service before the tip will be equal to $35.
The Percentage is defined as representing any number with respect to the 100. It is denoted by the sign %.
Given that:-
The total price of the service will be calculated as:-
20% = $7
10% = 7/2
100% = 10 x 7/2
100% = $35
Therefore the price of the service before the tip will be equal to $35.
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