Question

When fresh fish is dried,it becomes 2/3rd of its weight.Rahul bought 309 kg of fresh fish at the rate of ₹21 per kg and when dried ,he sold them at ₹90 per kg.He earned in all.

Answer 1

Fish When Dried Become 2/3 of its Weight

Rahul Bought=309 kg Fresh fish

CP of 1 kg=₹21

CP of 309 Kg=21×309

=6489

Total CP=₹6489

Now he sold when It become dry

Now Fish Will Weighs 2/3 of it

$309 \times \frac{2}{3} \\ \\ 103 \times 2 \\ \\ = 206 \: kg$

Means He sold 206 kg Fish

SP of 1 kg=₹90

206 kg=90×206

Total SP=18540

SP=₹18540

CP=₹6489

Total Earning or Gain=18540-6489

=₹12051

Answer 2

c.p = 309 ×21
=6489
if it dried its c.p should
6489×2/3 = 4326

but it sold at ..90×309×2/3
=18540
gained (18540-4326)
=14214