The value of an expression for the total amount that Mr.Randall paid for the shirts is $60.
From the information given, Mr Randall bought 4 shirts, which were on sal, the shirts were originally priced $20 and the salres price of the shirts was $5 dollars less than the original price.
The total amount that will be paid will be:
= ($20 - $5) × 4
= $15 × 4
= $60
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