How much does one pound of peaches cost?

Because we know the cost of two pounds of peaches, we can divide this value $(\$4.20)$ by two and find the cost of one pound of peaches.
$\$4.20\div2=\$2.10$

Think about what you did in Step 1. How can this help you find how much $5$ pounds cost?

By multiplying the cost of one pound by five, we will find the cost of five pounds.
$(\$2.10)(5)=\$10.50$

The cost of five pounds of peaches will be $\$10.50$.