2.

A school wants to order s copies of a new calculus textbook at a cost of $100 per
book and t copies of the applied activities textbook at a cost of $150 per book.
For every 6 copies of the calculus textbook the school orders, they must order at
least one copy of the applied activities textbook. The school's textbook budget is
$3,000.

What order will yield the greatest number of textbooks for the school?