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Project: the snack bill

Print three lines: Subtotal: 270, Tax: 13.5, Total: 283.5, worked out from the three prices.

Learn

Programs are good at repeating sums that change. Put the prices in variables, work out the subtotal, then the tax (5% is price × 5 / 100), then the total, and print each with a label using an f-string. When a price changes, only one line has to change.

Your task

Print three lines: Subtotal: 270, Tax: 13.5, Total: 283.5, worked out from the three prices.

Stretch challenge

Add a variable for a 10% tip and print a fourth line, Grand total.

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Project: a secret code

Encode the message with the shift: letters move forward, spaces stay as they are. hello world with a shift of 3 should print khoor zruog.

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Project: break the code

Write decode(text, shift) that undoes a shift code, and use it to read wkh txlfn eurzq ira (shift 3).

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