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Read the Question carefully and choose the correct option.
If the length and breadth of a rectangle are changed by +20% and by -10% respectively, then what shall be the percentage change in the area of the rectangle ?

(1) 4 % decrease
(2) 4 % increase
(3) 8 % decrease
(4) 8 % increase

यदि आयत की लंबाई और चौड़ाई को क्रमशः +20% और -10% से बदल दिया जाता है, तो आयत के क्षेत्रफल में प्रतिशत परिवर्तन क्या होगा?

(1) 4 % कमी
(2) 4 % वृद्धि
(3) 8 % कमी
(4) 8 % वृद्धि
This Question came in
UGC-NET-History-05-January-2026-Shift-2-Q17
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Detailed Explanation & Answer
Let's denote the original length as L and breadth as B.

The new length after a +20% change is:
New Length = L + 20% of L = L + 0.2L = 1.2L

The new breadth after a -10% change is:
New Breadth = B - 10% of B = B - 0.1B = 0.9B

The original area = L * B
New area = (1.2L) * (0.9B) = 1.08LB

Percentage change in area = ((New Area - Original Area) / Original Area) * 100 = ((1.08LB - LB) / LB) * 100 = 8% increase.

So, the correct answer is option (4) 8 % increase.
मान लीजिए कि मूल लंबाई L और चौड़ाई B है।

+20% परिवर्तन के बाद नई लंबाई:
नई लंबाई = L + 20% का L = L + 0.2L = 1.2L

-10% परिवर्तन के बाद नई चौड़ाई:
नई चौड़ाई = B - 10% का B = B - 0.1B = 0.9B

मूल क्षेत्र = L * B
नई क्षेत्र = (1.2L) * (0.9B) = 1.08LB

क्षेत्र में प्रतिशत परिवर्तन = ((नई क्षेत्र - मूल क्षेत्र) / मूल क्षेत्र) * 100 = ((1.08LB - LB) / LB) * 100 = 8% वृद्धि।

इसलिए, सही उत्तर विकल्प (4) 8% वृद्धि है।
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