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Ajay has a smart phone data plan that costs $\mathrm{\$}25$ per month that includes $9\mathrm{GB}$ of data, but will charge an extra $\mathrm{\$}20$ per GB over the included amount. How much would Ajay have to pay in a month where he used $5\mathrm{GB}$ over the limit? How much would Ajay have to pay in a month where he used went over by $x$ GB?
Answer Attempt 1 out of 2
Total cost when over by 5 GB:
Total cost when over by $x$ GB: $25x+$

Step 1 ：The problem is asking for two things. First, it wants to know how much Ajay would have to pay in a month where he used 5 GB over the limit. Second, it wants a general formula for how much Ajay would have to pay if he went over by x GB.

Step 2 ：To solve the first part, we need to calculate the total cost when Ajay goes over his limit by 5 GB. The cost of his plan is $25,andheischargedanextra$20 for each GB he goes over. So, the total cost would be the cost of the plan plus the cost of the extra data.

Step 3 ：To solve the second part, we need to come up with a formula that calculates the total cost based on the number of GB Ajay goes over his limit. The cost of the plan is a constant $25,andthecostoftheextradatais$20 times the number of GB over the limit.

Step 4 ：The total cost when Ajay goes over his limit by 5 GB is $\boxed{{\displaystyle 125}}$ dollars.

Step 5 ：The total cost when Ajay goes over his limit by x GB is $\boxed{{\displaystyle 25+20x}}$ dollars.