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Question
The price of an item x increases by ₹ 10 every year and an item y decreases by ₹ 15 every year. If in 2018, the price of x is ₹ 50 and y is ₹ 90, then which item will be costlier in the year 2020.
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Solution
Amount increases for x every year = ₹ 10.
Price of x in 2018 = ₹ 50
Price of x in 2019
= ₹ 50 + ₹ 10
= ₹ 60
Price of x in 2020 = ₹ 60 + ₹ 10
= ₹ 70
Amount decreases for y per year = ₹ 15
Price of y in 2018 = ₹ 90
Price of y in 2019 = ₹ 90 – ₹ 15 = ₹ 75
Price of y in 2020 = ₹ 75 – ₹ 15 = ₹ 60
Here 70 > 60
Item x will costlier in the year 2020.
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