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The sales of an article increases by 20% every week. The difference between the sales of the second week and the fourth week is Rs. 660. What were the sales of the article in the third week?

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Express each week's sales as a multiple of the first week using the 20% growth factor, then use the given difference to find the base value.
Updated On: Jul 20, 2026
  • Rs. 1,360
  • Rs. 1,480
  • Rs. 1,500
  • Rs. 1,720
  • Rs. 1,800
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The Correct Option is

Solution and Explanation

Take the sales of the second week itself as the base value, say $x$. Since sales rise by 20% each week, the third week sales are $1.2x$ and the fourth week sales are $1.2 \times 1.2x = 1.44x$.
The problem tells us that fourth week sales minus second week sales equals 660, so $1.44x - x = 660$, which gives $0.44x = 660$, so $x = 1500$.
That means the second week sales were Rs. 1,500, so the third week sales are $1.2 \times 1500 = 1800$.
The sales in the third week were Rs. 1,800.
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