jmc

The room is a 5 yard by 9 yard rectangle with a 3 yard by 5 yard rectangle removed from one corner. The area of the room is $(5\text{ yd.})(9\text{ yd.})-(3\text{ yd.})(5\text{ yd.})=30$ square yards. The total cost per square yard for the carpet and padding is \21.95+\2.55=\24.50$.Thetotalcostis$30$squareyardstimes$\$24.50$ per square yard, or $\boxed{735}$ dollars.