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Per NCERT, a salary starts at ₹5,00,000 with a constant annual increment of ₹20,000. This forms an AP. After how many years does the salary FIRST reach ₹7,00,000?
A10 years
B11 years (since 5,00,000 + (n−1)(20,000) = 7,00,000 → n−1 = 10 → n = 11)
CCannot be determined
D12 years
Answer & Solution
Correct answer: B. 11 years (since 5,00,000 + (n−1)(20,000) = 7,00,000 → n−1 = 10 → n = 11)
Per NCERT Exercise 8.2.6, set tₙ = 7,00,000: 5,00,000 + (n−1)(20,000) = 7,00,000 → n − 1 = 10 → n = 11.
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