how much interest is earned on principal of $400 invested at an interest rate of 3% for seven years​

$400 x .03 = $12

$12 x 7 years = $84

Step-by-step explanation:

the correct answer to your question is a. 4^4

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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