The cost of a botttle of mayonnaise is 0.¯7 times the cost of a bottle of vinegar. If the cost of a bottle of vinegar is ₹90, then find the cost of a bottle of mayonnaise.
A
₹70
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B
₹80
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C
₹90
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D
₹120
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Solution
The correct option is A ₹70 Let x = 0.¯7 , then 10x = 7.¯7 10x - x = 7.¯7−0.¯7 ⇒9x=7 ⇒x=79