7.50 admission; 20% off; 5.75% tax

For the 20% off, we can make the following rule of three:

7.50 --------------> 100%

x ------------------> 20%

From here, we clear the value of x.

We have then:

Then, subtracting both values we have:

For taxes we have:

6 ---------------> 100%

x'---------------> 5.75%

Clearing the value of x' we have:

Then, adding both values we have:

7.50 admission; 20% off; 5.75% tax is:

6.345

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step-by-step explanation:

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$18 was the price of the t-shirt

step-by-step explanation: