Naomi works in a music shop and earns $42 per day. she earns an extra $2 for each cd she sells. if naomi wants to earn at least $80 per day, which inequality shows the minimum number of cds, n, that she should sell?
42 + 2n ≤ 80, so n ≤ 19
42 + 2n ≥ 80, so n ≥ 19
42 + 2n ≥ 80, so n ≥ 36
42 + 2n ≤ 80, so n ≤ 36