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Problem of the Week

Problem D

Grandpa’s Math

Bryn’s Grandpa is always creating math problems for her to solve.
In one problem, he gave her a store receipt that listed 72 identical items, each the same price, for a total cost of

\[\$\ \bigstar \,6\, 7\,.\,9\, \bigstar\] Bryn’s Grandpa covered the first and last digits of the total price on the receipt with stars.
Determine the values of the digits that Bryn’s Grandpa covered.