Question

please help the question is 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? the options are 42+ 2n < 80, so n < 19,
42+2n>80, so n > 19,
42+2n>80, so n > 36,
and 42+2n<80,so n < 36