Question

the Marked price of a computer rs.22000 after allowing a 10% discount a dealer is still makes a profit of 20% find the cost price of a computer

Answer 1

The cost price of a product is the amount incurred in total to produce or manufacture the given item.
To find the cost price of the computer, assuming that this dealer is the manufacturer, the following is the procedure:

Profit = selling price - cost price

let the cost price be c
The selling price:  

= 10% discount
= discounted price = 100%(marked price) - discount (10%) = 90%
                              = 90%/100%  × 22000
                              = 0.9 × 22000
                              =  rs. 19800
This discounted price is the selling price.

Therefore profit  = 19800 - C

% profit = profit/ cost price ×100%

             = 19800-c/ c ×100% = 20%

             = 100(19800-c)/c = 20
 
             =   1980000 - 100c = 20c

             =  120c = 1980000
   
             =  c = 1980000/120

              c = Rs. 16500


Therefore the cost price of the computer is Rs. 16500

Answer 2

$holla \: buddy \\ \\ mp = 220000 \\ d = 10\% \\ discont = \frac{10}{100} \times 22000 \\ = 2200 \\ \\ hence \: \: \ \\ \\ sp = mp - dp \\ = 22000 - 2200 \\ \: \: = 19800 \\ profit\% = 20\% \\ \\ cp = \frac{100 \times sp}{100 + profit\%} \\ \\ \: \: \: = \frac{100 \times 19800}{100 + 20\%} \\ \\ \: \: \: \: = \frac{100 \times 19800}{120} \\ \\ \: \: \: \: \: \: = 16500 \\ \\ \\ mark \: me \: as \: brainlist \\ follow \: me \\ hit \: the \: thanks \: button$