To find the cost of Shivani's retirement party with 28 guests using unit rates, we can start by determining the cost per guest based on the information provided.
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Calculate the cost per guest: \[ \text{Cost per guest} = \frac{\text{Total cost}}{\text{Number of guests}} = \frac{81}{27} \] \[ \text{Cost per guest} = 3 \] So, the cost per guest is $3.
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Now calculate the total cost for 28 guests: \[ \text{Total cost for 28 guests} = \text{Cost per guest} \times \text{Number of guests} \] \[ \text{Total cost for 28 guests} = 3 \times 28 = 84 \]
Therefore, if there are 28 guests, Shivani's retirement party will cost $84.
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