You buy a soda for $1.42 and a hamburger for $7.00 the sales tax is 9.75%

(1.42 + 7.00) * 1.0975

Step-by-step explanation:

By adding up both of their prices, you can do the tax of multiplying by the decimal version of 109.75% as the tax is 9.75%. Given that,

The answer is $9.24