the question in English
50 t-shirts were sold at 10€ each. What benefit was obtained if the t-shirts were bought at 7€ each?
Let
x---------> the benefit in euros
we know that




therefore
<u>the answer is</u>
The benefit is equal to 
7 is the leases common I’m pretty sure
Exact form: 39/4
decimal form: 9.75
mixed number: 9 3/4
The correct answer is x=49