1.) The marked price of a pack of a juices is 1840 but ashopkeeper giv

1.	1.) The marked price of a pack of a juices is 1840 but ashopkeeper gives a small pack of juice costing 80free with it. By doing so, he still gains 10%. Find the cost price of a pack of juice.
Answer» Selling price of a pack of juice = 1840 Cost of a small pack of juice =80 (sold for FREE) PERCENTAGE of PROFIT gained =10% As the small pack of juice was sold for free, it's cost will be added to the cost price of the pack of juice. We know that :- $\bold{CP = \frac{100 \: \times \: SP}{100 \: + \: profit} }$ Then :- Let cost price be x. The cost price of this pack of juice= x+80 Which MEANS :- The cost price of this pack of juice :- $= x + <klux>80</klux> = \frac{100 \times 1840}{100 + 10}$ $= x + 80 = \frac{184000}{110}$ $= x + 80 = \frac{18400\cancel0}{11\cancel0}$ $= x + 80 = \frac{18400}{11}$ $= x + 80 = 1672.72$ $= x = 1672.72 - 80$ $= x =\bold{ 1592.72}$ Thus, the cost price = 1592.72 Therefore, the cost price of a pack of juice = 1592.72