Question

Kate decides to replace all the lights in her college apartment with energy saving light bulbs beginning this month. The packaging says the new bulbs will use​ 75% less electricity. If​ Kate's electric bill last month was​ $7.29 from bulb use​ alone, project how much​ Kate's electric bill will be this month for bulb use. Round your answer to the nearest cent.

Answer 1

Kate's bill for this month for one bulb will be $1.8225

Further explanation:

Given

Old Bill for one bulb use = $7.29

Percentage of reduction in bill = 75%

To find the new bill, we have to find the amount of saving that Kate will get by using the energy saver and then the amount will be subtracted from the previous bill of $7.29

So, the new bill will be:

$New\ bill = Old\ bill- (saving)\\New\ Bill= 7.29 - (7.29 * \frac{75}{100})\\= 7.29 - 5.4675\\= 1.8225$

Hence the bill this month will be $1.8225

Keywords: Percentage, discount

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