Alan took a vacation trip to Maine, where sales tax on taxable items is 5%. In
Maine, prepared food and lodging are taxed an additional 2%, for a total of 7%
tax, while auto rentals are taxed an additional 5%, for a total of 10% tax.
Alan bought $90 worth of souvenirs, taxable at the general rate. He also spent
$420 on prepared food and lodging and $510 for a rental car, all before tax.
How much did he spend in total after tax was included?