Question

cost of one doll Rs.63.50. find the cost of 87such dolls​

Answer 1

Answer:

Rs.5524.50

Step-by-step explanation:

unitary method

cost                         dolls

 Rs.63.5                    1

      x                          87

So, we will cross multiply them.

Rs 63.5 x 87 = 1 x X

X= Rs 5524.5

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Answer 2

Uniyary method

Cost of one doll = Rs. 63.50

Cost of 87 dolls = 63.50 * 87

Cost of 87 dolls = Rs. 5524.5

Proportion method :

Let the cost of 87 dolls be Rs. x

Proportion : 1 : 87 : : 63.5 : x

Product of extremes = Product of means

Here extremes = 1, x ; means = 87, 63.5

1 * x = 87 * 63.5

x = 5524.5

$\tt{Cost\:of\:87\:dolls\:is\:Rs.5524.5}$