Question

three watch are purchased at rupees 450 each one of them is sold at a loss of 10% at what price should the to be sold so as to gain 20% on the whole transaction ​

Answer 1

Step-by-step explanation:

cp of whole = 450×3 = 1350

profit on whole = 20%

sp on whole = 1440

cp of one watch = 450

loss= 10%

sp of one watch = 405

cp of other two watches = 450×2=900

total cp of all watches = 405+900=1305

required sp = 1440

difference = 1440-1305=135

sp of other two watches = 900+135 = 1035

Answer 2

Answer:

Price of 1 watch =450

Total cp =450x3

= ₹1350

By selling one we got 10%

Cp=450

Loss%=10%

Sp= cp x(100-loss%)/100

Sp=450x(100-10)/100

Sp=450x90/100

Sp=45x9

Sp=405

Loss=450-405=45

Now he wants to earn 20% profit on whole transaction

Cp=1350

Profit=20%

Sp=cpx(100+profit %) /100

Sp=1350x(100+20)/100

Sp=1350x120/100

Sp=135x12

Sp=1620

Two watch must be sell for = sp after 20% - Sp of first watch

=1620-405

=1215

Sp of one watch must be =1215/2

=607.5