Answer:
12.5%
Step-by-step explanation:

= 12.5%
Percentage of total cost that is the payments= 12.5%
1) 10.25 x 10^9 in scientific notation is 1.025 x 10^10
2) Now you have to subtract 10.25x10^9 - 3.0x10^7
To make that you have to put both numbers with the same power of ten.
1025x10^7 - 3.0x10^7 = 1022x10^7 more pennies than half-dollars.
0.30 meter is equal to 1 foot
Notice the picture below
now, we know their perimeter are the same for both
thus 4(a+4) = 6a
solve for "a"