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As the cost of 4 dozen bananas is Rs 180 then the cost of 1 banana is around Rs 3.7.rn rn Given that, Cost of 4 dozen bananas = 180 rupeesrn ∴Cost of 1 dozen bananas = 1804=45 rupees …1rn As we know that 1 dozen =12items.rn ∴1 dozen bananas contains 12 bananas.rn From equation 1, we calculate the cost of 1 dozen i.e. 12 bananas =45rupeesrn ∴the cost of 1 banana =4512rupees …2rn rn Since, we have to calculate the number of bananas that can be purchased for Rs 90, first we will calculate the number of bananas we can purchase for 1 rupee.rn From equation 2, we calculate the number of bananas for 1 rupee =1245rn Now, Number of bananas for 90 rupees =90×1245rn =24rn ∴ Total number of 24 bananas can be purchased for 90 rupees.rn rn Note: In such types of problems, one should always try to calculate the items per 1 rupee first and then multiply it by the required amount asked in the question or calculate the cost per 1 item and multiply it by the number of items.
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