The amount of tax on a chair was $3.60. The tax rate was 5%. Find the original price of the chair. Bianca solved the problem below. Find Bianca's error. 0.05 (3.60) = Original price The original price is $0.18.

Given:

tax value = 3.60

tax rate = 5%

To solve for the tax value, we use this formula:

Tax value = Original price * tax rate

Since the original price is missing, we derive the formula from the above formula:

Original price = tax value : tax rate

Original price = 3.60 : 5%

Original price = 72

The original price is 72.

72 x 5% = 3.60