A customer wants to mail a package. The postal clerk determines the cost of the package to be $5.91 , but only 6¢ and 9¢
stamps are available. Can the available stamps be used for the exact amount of postage for the package? Why or why not?
6*98 = 588
so 98 6¢ stamps will be 3¢ short.
So instead, buy 97 6¢ stamps, plus 1 9¢ stamp to make up the difference.