If some amount of money was invested by A initially and B joined him after 6 months by investing 80% more than what A initially invested .The ratio of profit of A to that of B after one year is -

10:9

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9:10

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6:5

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7:8

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Solution

The correct option is A
10:9

Let the investment of A be `a'

Let the investment of B is `1.8a'

$\frac{I n v e s t m e n t o f A \times t i m e o f i n v e s t m e n t o f A}{I n v e s t m e n t o f B \times t i m e o f i n v e s t m e n t o f B}$ = $\frac{P r o f i t o f A}{P t o f i t o f B}$

$\frac{a \times 12}{1.8 a \times 6}$ = $\frac{10}{9}$

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If some amount of money was invested by A initially and B joined him after 6 months by investing 80% more than what A initially invested .The ratio of profit of A to that of B after one year is -

The correct option is A 10:9 Let the investment of A be `a' Let the investment of B is `1.8a' Investment of A ×time of investment of AInvestment of B ×time of investment of B = Profit of APtofit of B a ×121.8a ×6 = 109