Exam Maths Puzzle Percentage

Joe spent $2500 on garage doors. He paid 6% sales tax. What was the original cost of the garage doors?

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Exam Other Question

What is the formula to figure out the percentage? Example 75=?% of 98.. How would you show the regions which satisfy (or plot on a graph) the inequality :
x + y < 3
and
x - y > 2
I am year 8. Thank you, Nicole