Kuldeep has been hired to lay terracotta tiles on a floor that measures \(4.2\) m by \(3.8\) m. The tiles are \(9\) by \(9\) and come in boxes of \(12\).

a) How many boxes must he buy? (He cannot buy a partial box.)

b) If the tiles cost \(\$18.95\) per box, how much will the tiles cost in total?