What is the value o(f 5.3 * 10^4 ) ( 4.2*10^3) in scientific notation?

( 5.3 * 10^4 ) ( 4.2*10^3)

Multiply the numbers and add the exponents

(5.3 * 4.2) * 10 ^ (4+3)

22.26 * 10^7

now we have to adjust since more than 1 number is in front of the decimal

2.26 * 10^(7+1)

2.26*10^8

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