Requirement: Use app inventor for android. This can be found on page 318, number 7 in the Starting Out With App Inventor For Android. The problem reads as follows:

Joe's automotive performs the following routine maintenance services:

Oil Change - $25.00

Lube Job - $20.00

Radiator Flush - $30.00

Joe also performs other non-routine services and charges for parts and labor($30 per hour). Create an app that displays the total for a customers visit to Joe's. The app's screen should include check boxes for oil change, lube job, and radiator flush, textboxes for parts and labor, a calculate button, and textboxes for subtotal, tax(on parts) and total charges. The app should include the following functions:

OilLubeCharges- Returns the total charges for an oil change and/or a lube job and/or a radiator flush.

OtherCharges- Returns the total charges for other services(parts and labor) if any.

TaxCharges - Returns the amount of sales tax,if any. Sales tax is 6% and is only charged on parts. If the customer purchased services only, no sales tax is charged.

TotalCharges- Returns the total charges.