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Question
Lalit earns Rs x per day and spends Rs y per day. How much does he save in 30 days?
Solution
Lalit's earning per day = Rs x
∴ Lalit's earning in 30 days = Rs 30 × x
= Rs 30x
Similarly, Lalit's expenditure per day = Rs y
∴ Lalit's expenditure in 30 days = Rs 30 × y
= Rs 30y
∴ In 30 days, Lalit saves = (Total earnings − Total expenditure)
= Rs (30x − 30y)
= Rs 30(x - y)
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