Let x denote the number of muffins Marian sells in a day to at least make a profit. So $1.00 × x will be the amount of revenue Marian earns from selling bread (don't mix revenue with profit. Profit = Revenue - Cost) In order for Marian to make a profit, revenue must be greater than cost in a day. $1x > 0.8x + (square root)[5x + 7000] x > 0.8x + (square root)[5x + 7000] { ">" this sign is saying "more than" } 0.2x > (square root)[5x + 7000] {square both sides} 0.04x > 5x + 7000 -4.96x > 7000 4.96x < 7000 x < 7000 ÷ 4.96
Hope this helps you solve! :) So sorry for my wrong judgement earlier..