To solve this problem, we will set up and solve the inequality for the number of pastries, \( p \), that need to be sold to reach the goal of at least $135. The expression for the revenue from selling \( p \) pastries at $2.50 each is \( 2.50p \).
The inequality can be set up as follows:
\[ 2.50p \geq 135 \]
Next, we will isolate \( p \) by dividing both sides of the inequality by 2.50:
\[ p \geq \frac{135}{2.50} \]
Calculating the right-hand side:
\[ \frac{135}{2.50} = 54 \]
So, we have:
\[ p \geq 54 \]
This means they need to sell at least 54 pastries to meet their goal.
The correct option from the choices you provided is:
2.50p ≥ 135; p ≥ 54