The selling price of a refrigerator, is $856.90. If the markup is 10% of the dealer's cost, what is the dealer's cost of the refrigerator?

The dealer paid 'C' for it.  He decided to sell it for 10% more than C .

That would be (1.10 C) , and that's the $856.90 .  

So the equation is . . . 1.10 C = $856.90

Divide each side by 1.10 : C = $856.90 / 1.10

C =  $779

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐