Answer:
Approximate decrease is 70%
Step-by-step explanation:
The percent decrease is the change over the new original / final value. The change between the old and the new is 850 - 500, which is 350. Thus the approximate percentage difference is
<u>350</u>
500
A quick way to turn anything with a denominator that starts with 5 and any number of zeros after it ... is to multiply both the top and bottom by 2. That is, that turns the ratio above to:
<u>700 </u>
1000
Since a percentage is a number of 100, not 1000, just divide everything by 10. That means take away a zero from each number, which gives you a fraction of:
<u>70 </u>
100
Thus, the result is 70/100, or 70%.
