Eileen is able to save 13% of her allowance each month.
What we have here is called INTERSECTING CHORDS IN A CIRCLE.
The equation is:
10 times x = 7 times 7
10x = 49
x = 49/10
x = 4.9
80 Because the numbers are going up by 10
$2.16 per 0.9 pounds of granola
