The cost of a calculator is $2.50 less than five times the cost of a notebook. If Jordan purchases one calculator and one notebook, the total cost is $20. Find the cost of the calculator.

Note book is $20

calculator is $2.50 less than five times the cost of a notebook, then:

5 * $20 - $2.50 = $100 - $2.50 = $97.50

calculator: $97.50

notebook: $20

Total cost: $97.50 + $20 = $117.50

answer: total cost of one calculator and one notebook: $117.50