1) As a start you have 100% of contaminants: so
the 1st filtration you removed 70% & remaining 30%
the 2nd filtration you removed 70% of the 30% (=21%) & remaining (30%-21%)
or 9%
the 3rd filtration removed 70% of the 9% (=6.30%) & remaining (9%-6.3%)
or 2.7%
the 4th filtration removed 70% of the 2.7% (1.89%) & remaining (2.7%-1.89%)
or 0.81%
Follow the same logic for all remaining question.
1x100,000 = 100,000
3x10,000 = 30,000
9x1,000 = 9,000
8x100 = 800
5x10 = 50
2x1 = 2
Add these all together to get your answer. Standard form is the form we usual write numbers in.
Answer:
-4100
Step-by-step explanation:
Using the percentage, the amount raised in the first three month is $840
<h3>How to find the amount raised in 3 months?</h3>
The Helping Hands Student Club set a goal to raise $3,000 by the end of the school year for a project.
After 3 months, it reaches 28 percentage of its goal.
The amount that was raised during the first three months can be calculated as follows:
amount raised = 28% × 3000
amount raised = 28 / 100 × 3000
amount raised = 84000 / 100
Therefore,
the amount raised in the first three month = $840
learn more on percentage(%) here: brainly.com/question/384547
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The result can be shown in both exact and decimal forms.
Exact Form:
2
3
Decimal Form:
0.
¯
6
