To find the total cost
Given:
- Cost per pound = $3.90
- Number of pounds = 312
The total cost
Thus, the equation that represents the total cost is:
However, none of the equations presented in your responses accurately represents this relationship or directly computes
To clarify, the total cost that she should pay, calculated directly, is:
It appears the options given in your question do not correctly represent the situation. Please check the options again or restate them so I can assist you further in identifying the correct one.