Test:333 QNo:97

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A man has 390000 rupees on retirement. He gets 5000 per month as pension. his expenditure of 1st month is 5000. His expenditure increases by Rs 500 every month. When will he be bankrupt?

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virang1 Jhaveri ·2009-04-15 22:49:07

Expenditure is in Ap
A = 5000
d = 500
Summation Of Ap= n(2*5000 + (n-1)*500/2
Money he will have = 390000 + 5000*n
390000 + 5000*n = n(2*5000 + (n-1)*500/2
390000 = n[10000 + 500n - 500 - 10000]/2
39 * 10⁴ = n(500n - 500]/2
78*10⁴ = 500n² - 500n
7800 = 5n² -5n
1560 = n² - n
1 Â± âˆš1+6240/2
1 + 79 /2
40 months
In 40 months he will get bankcrupt

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° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

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Test:333 QNo:97

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