Pedro wants to buy some shirts over the internet. each shirt costs $10.01 and has a shipping cost of $9.94 per order. if pedro wants to spend no more than $70 for his shirts, which inequality shows the maximum number of shirts, p, that he can buy?

9.94 + 10.01p ≤ 70, so p ≤ 6
9.94 − 10.01p ≤ 70, so p ≤ 7
9.94p + 10.01p ≤ 70, so p ≤ 8
9.94p − 10.01p ≤ 70 ≤ 60, so p ≤ 9