$2-10.$ A mail carrier at the U$.$S$.$ Postal Service works on Sunday delivering high$-$priority letters and packages. They can deliver $15$ items per hour. The fixed hourly costs $($vehicle depreciation, insurance, etc.$)$ equal $$42$ and the hourly variable costs $($time and a half wages, etc.$)$ total $$0\mathrm{.}50$ per item delivered. How much must the U$.$S$.$ Postal Service charge for each item delivered in order to breakeven on Sunday deliveries? $(2\mathrm{.}2)$