The answer is $143.70
(Work is below)
First calculate sales tax by multiplying $124.95 x 0.07 -
Model Rocket Kit: $124.95
Sales Tax Rate: $ 0.07
x__________
$ 8.7465
You round up because ^ more than five (four or below you would round down)
Sales Tax: $8.75
Then you add the sales tax to the model rocket and add the shipping.
Model Rocket Kit: $124.95
Sales Tax: $ 8.75
Shipping $ 10.00
+__________
$143.70