Answer:
12 problems
Step-by-step explanation:
All problems were of equal value
Let x be the number of problems in the test
We apply a rule of three
x ------------------------------- 100%
(x-10) --------------------------- 17%
(x-10)*100%/(x) = 17%
(x-10)/(x) = 0.17
(x-10) = 0.17*x
0.83*x = 10
x = 12.05
x = 12 problems
Each of the 223 million people put $10 back into circulation every year.
![\sf 223,000,000\times 10=2,230,000,000](https://tex.z-dn.net/?f=%5Csf%20223%2C000%2C000%5Ctimes%2010%3D2%2C230%2C000%2C000)
So every year, this much money goes into circulation, and this is how much that goes into circulation the first year.
![\sf 2,230,000,000+2,230,000,000=4,460,000,000](https://tex.z-dn.net/?f=%5Csf%202%2C230%2C000%2C000%2B2%2C230%2C000%2C000%3D4%2C460%2C000%2C000)
This is how much that will be in circulation after 2 years.
![\sf 4,460,000,000+2,230,000,000=6,690,000,000](https://tex.z-dn.net/?f=%5Csf%204%2C460%2C000%2C000%2B2%2C230%2C000%2C000%3D6%2C690%2C000%2C000)
This is how much that will be in circulation after 3 years.
So we can create the table:
A line with a slope of zero is a horizontal line having the general equation of y = b.
![w+w+w+w+w+15-7=\underbrace{w+w+w+w+w}_5+(15-7)\\\\=5w+8-\text{finish}\\\\\text{You can not add 5w and 8. These are different monomials.}](https://tex.z-dn.net/?f=w%2Bw%2Bw%2Bw%2Bw%2B15-7%3D%5Cunderbrace%7Bw%2Bw%2Bw%2Bw%2Bw%7D_5%2B%2815-7%29%5C%5C%5C%5C%3D5w%2B8-%5Ctext%7Bfinish%7D%5C%5C%5C%5C%5Ctext%7BYou%20can%20not%20add%205w%20and%208.%20These%20are%20different%20monomials.%7D)
Example:
5w - five apples
8 - eight strawberries
5w + 8 = (five apples) + (eight strawberries) = 13 of what?
You can add only numbers of the same fruits.
Point III is about <em>real interest rate</em>
point I doesn't apply since both nominal and effective ir are calculated by year
let alone the fact that if you look close to those numbers it would probably mean that the loan had 1year and 1 day duration :)
the II answer is the correct one
if the loan is compounded at 6 months you have to add the interest of the first 6 months interest to the total interest to find out the effective interest rate