At noise pollution cellular, plan a is $30.00 per month and $5.00 for every gigabyte of data . plan b is $50.00 per month and $2.00 for every gigabyte of data used. irfan wants to find out which plan is the best choice for him. on average, he uses five to eight gb of data per month

Let x be the number of gigabyte of data used.

Plan A:
Total cost = 30 + 5x

Plan B:
Total cost = 50 + 2x

Irfan will use between 5 to 8 gb of data per month.

When x = 5
Plan A = 30 + 5(5) = $55
When x = 8,
Plan A = 30 + 5(8) = $70

When x =5,
Plan B = 50 + 2(5) = $60
When x = 8,
Plan B = 50 + 2(8) = $68

He is probably better off using Plan A. Plan A is a cheaper option up to 7gb of data. He should only swap to Plan B if he consistently use 8gb or more data per month.