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4-47.

The cost of renting a limousine for the senior ball in Beverly Hills is $\150$ for up to $3$ hours and then $\40$ per hour for each additional hour. Express this cost as a piecewise-defined function.

Hours

Cost $\left(\\right)$

$0$

$150$

$1$

$150$

$2$

$150$

$3$

$150$

$4$

$190$

$5$

$230$

$6$

$270$