Hey can anyone help on this one it's worth 20 points.

Answer:
So his allowance is 25 dollars
6.50 dollars he used to buy the banana splits which is 26%
Step-by-step explanation:
So 3.25 for 1 banana splits
then for 2 its 2 × 3.25 = 6.50 dollars
So 26% of a number let say n is 6.50 dollars
26/100 × n = 6.50
0.26 × n = 6.50
n = 6.50/0.26
n = 25
So his allowance is 25 dollars
6.50 dollars he used to buy the banana splits which is 26%