Answer:
Sum = $1.073
Interest = $0.073
Step-by-step explanation:
Given that $1 is invested for one year at 7.2% interest which compounds semi-annually.
Semi-annual means there should be two equal intervals in a year i.e. 6 months interval.
Now, the semi-annual rate of interest is 
%.
Therefore, the invested money will become ![1\times [1 + \frac{3.6}{100} ]^{2}](https://tex.z-dn.net/?f=1%5Ctimes%20%5B1%20%2B%20%5Cfrac%7B3.6%7D%7B100%7D%20%5D%5E%7B2%7D)
= $1.073
Therefore, the interest obtained will be $(1.073 - 1) = $0.073. ( Answer )
Answer:
Well elimination is basically multiplying a number to make it possible for it to cancel out
We can multiply the first equation by 2
2(x+2y=-1)
This would be
2x+4y=-2
Its still the same thing but just with non simplified numbers
We can now do any method really to solve
I will just do the subtraction method
2x+4y=-2
-2x+y=4
Solve
2x-2x=0
4y-y= 3y
-2-4= -6
3y= -6
Now solve
y=-2
To find x subsitute in “y” and find ”x”.
x+2*-2=-1
x-4=-1
x=3
y= -2
x= 3
y: original price (in dollars)
0.12y: amount of discount (in dollars)
sale price: y - 0.12y = 0.88y
sales tax on this sale price: (0.06)(0.88y)
final cost: 0.88y + (0.06)(0.88y) = 0.88y(1+0.06) = 0.9328y
