Question

Please help with this question, will be appreciated if there is an explanation

Answer 1

If they manage to sell $t$ tickets, they will earn $15\cdot t$ dollars. We want this number to be at least 1000, so the inequality would be

$15t>1000$

In order to solve this for t, you only need to divide both sides by 15:

$15t>1000\iff t>\dfrac{1000}{15} = 66.\overbar{6}$

So, they need to sell at least 67 tickets to have an income of

$15\cdot 67 = 1005$ dollars