If the haircut costs $22 but you have a 25% discount it means the price will be multiplied by 0.75.
22 × 0.75 = 16.5
a) Her bill with the discount will be $16.5
Now she has to pay 20% extra for the tip. We just need to discover how much she will pay as tip
To discover that we just need to multiply the price by 0.2
16.5 × 0.2 = 3.3
b) She will pay $3.3 of tips
I hope you understood my brief explanation
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