Malti earns $₹ 21600$ in one and half month. How much does she earn in $20$ days?

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Solution

Convert one and half month in days:
We know that,
$1 m o n t h = 30 d a y s$
One and half month $= 30 d a y s + 15 d a y s = 45 d a y s$
In $45$ days Malti earns $=$ $₹ 21600$
In $1$ day Malti earn $=$ $₹ \frac{21600}{45} = ₹ 480$
In $20$ days Malti earns $=$ $₹ 480 \times 20 = ₹ 9600$
Hence, Malti earns $₹ 9600$ in $20$ days.

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