A tennis racquet with an original price of $30 is on sale for $21. What is the percent of discount?

30%

Step-by-step explanation:

9=30x solve for x to get .30

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540