To find the final cost after applying the 20% coupon to the original grocery cost of $240, follow these steps:
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Calculate the discount amount: \[ \text{Discount} = \text{Original Cost} \times \text{Discount Rate} \] \[ \text{Discount} = 240 \times 0.20 = 48 \]
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Subtract the discount from the original cost: \[ \text{Final Cost} = \text{Original Cost} - \text{Discount} \] \[ \text{Final Cost} = 240 - 48 = 192 \]
Thus, the final cost after using the coupon is $192.