SaiBook.us SAT-1

Home Course Section

Schedule Admission Social

Step-5

Title: Percentage Decrease

Grade: 1300-a Lesson: S4-L4

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	Find 280 decreased by 4%.
2	Step	Firstly, the percent of fractional multiple	280 of 4 %
3	Step	The percentage sign % means percent, equivalent to the fraction of \$1/100\$	\$280 \times (4/100)\$
4	Step	After simplification	\$(280 \times 4)/100\$ = \$11.2\$
5	Step	Subtract the result from Step 3 to the original value	\$ 280 - 11.2 \$ = \$268.8\$
6	SumUp	Can you summarize what you’ve understood in the above steps?
7	Choice.A	This is incorrect. It represents a decrease of only 1.1%, not 4%	278.9
8	Choice.B	It is correct. It accurately reflects the result of decreasing 280 by 4%	268.8
9	Choice.C	This is incorrect. It represents a decrease of only 0.1%, not 4%	279.8
10	Choice.D	This is incorrect. It represents an increase of 0.1%, not a decrease of 4%	280.8
11	Answer	Option	B
12	SumUp	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

Find 280 decreased by 4%.

Step

Firstly, the percent of fractional multiple

280 of 4 %

Step

The percentage sign % means percent, equivalent to the fraction of \$1/100\$

\$280 \times (4/100)\$

Step

After simplification

\$(280 \times 4)/100\$ = \$11.2\$

Step

Subtract the result from Step 3 to the original value

\$ 280 - 11.2 \$ = \$268.8\$

SumUp

Can you summarize what you’ve understood in the above steps?

Choice.A

This is incorrect. It represents a decrease of only 1.1%, not 4%

278.9

Choice.B

It is correct. It accurately reflects the result of decreasing 280 by 4%

268.8

Choice.C

This is incorrect. It represents a decrease of only 0.1%, not 4%

279.8

Choice.D

This is incorrect. It represents an increase of 0.1%, not a decrease of 4%

280.8

Answer

Option

SumUp

Can you summarize what you’ve understood in the above steps?