camelback brewery sells t-shirts to tourists who tour the brewer facility. These shirts sell for $15. At the end of every month, Camelback likes to have enough -shirts in inventory to cover 20% of next month's sales, as sometimes the t-shirt supplier is slow in delivering new inventory. Camelback has 90 t-shirts in invetoryat the endof December. How many shirts did the brewer order from their supplier in February?

predicted shirt sales below in quantities

Jan-300

Feb-420

Mar-390