6th grade problem lol

Answer:
The required fence to be purchase = 191.4 feet
Step-by-step explanation:
A rectangular yard is fenced using a fence of = 319 feet .
But friends yard is [tex]\frac{8}{5}[/tex] times larger so the required fence = 510.4 feet.
They have to purchase fence = (510.4 -319) feet = 191.4 feet