Answer
The total owed is $3,258.50.
Work Step by Step
The cost of the bird cages is $4\times980=3920$ dollars.
70% of the cost was borrowed so the principle is $3920\times0.7=2744$= dollars.
interest = principle * rate * time
$i=(2744)(0.075)(2.5) = (205.80)(2.5)= 514.50$
total owed=principle+interest
$t=2744+514.50=3258.50$