A treatment plant with a capacity of 20 MGD (million gallons per day) has a normal daily flow equal to \( 60 \% \) of capacity When if rains the flow increases by \( 20 \% \) of the normal flow What is the flow on a rainy day?
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On a rainy day, the flow can be determined starting with the normal daily flow. Given that the treatment plant's capacity is 20 MGD, the normal daily flow is \( 60\% \) of that, which equals \( 0.6 \times 20 \text{ MGD} = 12 \text{ MGD} \). When it rains, the flow increases by \( 20\% \) of this normal flow. So, \( 20\% \) of \( 12 \text{ MGD} \) is \( 0.2 \times 12 \text{ MGD} = 2.4 \text{ MGD} \). Therefore, the total flow on a rainy day is \( 12 \text{ MGD} + 2.4 \text{ MGD} = 14.4 \text{ MGD} \). So, the flow on a rainy day is 14.4 MGD!