Question 104484
Let x=the cost of the shirt

Then,

    0.06x=the tax of the shirt

Thus, if the total cost---the shirt and the tax---have to reach the maximum amount, $30.00,

                                   x+0.06x=30
                             100*(x+0.06x)=100*(30)
                                   100x+6x=3000
                                      106x=3000
                                         x=$28.30


therefore, he could only buy a shirt with amaximum price of $28.30!