Solve for x: -42 = -7x
2 answers:
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Answer:
400%
Step-by-step explanation:
Let the sales be "100" in 1994
Since, it decreased 80%, the sales was:
80% = 80/100 = 0.8
0.8 * 100 = 80 (decreased by 80)
So, it was
Sales in 1995: 100 - 80 = 20
Sales in 1996 was same as in 1994, so that's 100
Thus,
Sales in 1994: 100
Sales in 1995: 20
Sales in 1996: 100
We need to find percentage increase form 1995 to 1996, that is what percentage increase is from 20 to 100?
We will use the formula:
Where
New is 100
Old is 20
SO, we have:
So, it increased by 400%
The total amount due after a given period of time is given by the following formula:
This is for simple interest. <em>A</em> is the total amount due. <em>t</em> is the period of time, <em>r</em> is the interest rate and <em>P</em> is the initial amount borrowed.
To use the formula, <em>t</em> and <em>r</em> must have the same unit of time (both in years or both in months for example). We have the yearly rate as 15%, or well, 0.15. The period is 6 months, which will be half a year, or well, 0.5 years. With this information, we can now replace the values on the formula:
With this, the total amount due will be $3225.
Alternatively, we can first calculate the interest due with the following formula:
And add this amount to the initial amount of money borrowed to estimate the total amount due.
After six months, the student has to pay the $3000 borrowed, plus $225 of interest:
Answer. Total amount due after 6 months: $3225.