Give the step-by-step reasoning process and then the final answer. 4 friends went to buy from a clothes shop. Every item was 50% off. All four friends decided to buy a t-shirt. The original price of the t-shirt was 20 dollars. How much money did they spend in total?
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After the 50% discount, the t - shirt cost 20 * 0.5 = $10. So in all, the 4 friends spent 4 * $10 = $40.
The final answer: 40.
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