Mrs. Dolores is shipping a package to her grandkids. The post office charges a shipping fee of $9 plus $.50 per pound. Ship4U charges a shipping fee of $6 plus $.80 per pound. Which inequality best represents the number of pounds the package can weigh for Ship4U to be the cheaper option?



Answer :

Answer:

X < 10  
where X is the weight of the package in pounds

The package should weigh less than 10 pounds for Ship4U to be the cheaper option

Step-by-step explanation

Let the weight of the package be X pounds

Cost of shipping by Post Office = 9 + 0.5X

Cost of shipping by Ship4U = 6 + 0.8X

For Ship4U to be the cheaper option
6 + 0.8X < 9 + 0.5X

Subtract 6 on both sides and subtract 0.5X from both sides:
0.8X - 0.5X < 9 - 6
0.3X < 3

Divide by 0.3 on both sides
0.3X/0.3 < 3/0.3

X < 10

The package should weigh less than 10 pounds for Ship4U to be the cheaper option

At a weight of 10 pounds, both shipping costs are the same
Post Office cost for 10lb package = 9 + 0.5(10) = 9 + 5 = $14
Ship4U cost for 10lb package = 6 + 0.8(10) = 6 + 8 = $14