Answer:
Inequality :

Step-by-step explanation:
Let the unknown number be x
at most -70 = ≤ -70

Solving further :

X = total sales
y = sharon's commision earnings
Since Sharon makes 4% of the total sales, we want to calculate how many sales equate to a $150 return. Since 4% = .04, the solution would be :
y = .04 x
150 = .04 x
150/.04 = x
3750 = x
3 packs of pencils ( 30 pencils)
5 packs of erasers (30 erasers)