After lunch, hailey goes to the pet store. suppose hailey buys 5 guinea pigs at 20% off the original price of g dollars per guinea pig, which expression will not give hailey's total cost?
a) 4g
b) 5g
c) 5g − 0.2(5g)
d) 5g − 1g

Option B

The expression 5g will NOT give Hailey's total cost

Solution:

Given that Hailey buys 5 guinea pigs at 20% off the original price of g dollars per guinea pig

From given information,

Number of guinea pigs bought = 5

Original price = g dollars

Given that Hailey has bought 5 guinea pigs at 20% off

Price at which hailey bought pigs after offer is given as:

price per guinea pig after offer = g - 20 % of g

Total cost for 5 guinea pigs:

Total cost = 5(g - 20% of g)

The above expression can be written in different ways:

or

or

Thus Option A, Option C, Option D are correct

So Option B will NOT give Hailey's total cost

the graph top, left is y = 4x