Answer:
She must buy groceries of worth $100.00
Step-by-step explanation:
The membership fees of food co-op store = $10.00
After joining Roberta will get 10% off on all the groceries she buys here.
She wants to buy items so that her savings must be equal to her membership fee.
Let the amount of groceries that she wants to buy be 'x'
Therefore, equation will be
10% × x = $10
0.10 × x = $10
x = 10 ÷ 0.10 = $100
Roberta must buy the items worth $100, so that her savings would be equal to her membership fee.
