Final answer:
Erin needs to rent 15 chairs for the cost of the rentals to be the same.
Step-by-step explanation:
To find the number of chairs Erin needs to rent for the cost of the rentals to be the same, we need to set up an equation.
Let x be the number of chairs Erin needs to rent.
For A-1 Rental, the total cost is 1.57x + 63.51.
For Tonka Tents, the total cost is 1.82x + 59.76.
Setting these two equal to each other:
1.57x + 63.51 = 1.82x + 59.76
Subtracting 1.57x and 59.76 from both sides:
3.75 = 0.25x
Dividing both sides by 0.25:
x = 15
Therefore, Erin needs to rent 15 chairs for the cost of the rentals to be the same.