Simple percentage question
Maths and statistics discussion, revision, exam and homework help.
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Simple percentage questionHi, so i'm about to embarrass myself here.
I have 2 questions on an exam.
1) X has increased 1% to 2,537. What was the value of X originally?
2) X has decreased by 9% to 1,586. What was the value of X originally?
I did question 1) as follows (so you can see my working):
X + 0.01X = 2537
1.01X = 2537
X= 2537 / 1.01 = 2511.88
2511.88 has increased 1% to 2537.
How do I do a decrease calculation?? Obviously if I follow the same logic I get a lower number, I need a higher one... -
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Re: Simple percentage question1 is correct(Original post by aewart)
Hi, so i'm about to embarrass myself here.
I have 2 questions on an exam.
1) X has increased 1% to 2,537. What was the value of X originally?
2) X has decreased by 9% to 1,586. What was the value of X originally?
I did question 1) as follows (so you can see my working):
X + 0.01X = 2537
1.01X = 2537
X= 2537 / 1.01 = 2511.88
2511.88 has increased 1% to 2537.
How do I do a decrease calculation?? Obviously if I follow the same logic I get a lower number, I need a higher one...
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- Reputation:
- TSR Royalty
Re: Simple percentage questionYou do follow the same logic(Original post by aewart)
Hi, so i'm about to embarrass myself here.
I have 2 questions on an exam.
1) X has increased 1% to 2,537. What was the value of X originally?
2) X has decreased by 9% to 1,586. What was the value of X originally?
I did question 1) as follows (so you can see my working):
X + 0.01X = 2537
1.01X = 2537
X= 2537 / 1.01 = 2511.88
2511.88 has increased 1% to 2537.
How do I do a decrease calculation?? Obviously if I follow the same logic I get a lower number, I need a higher one...
x - 0.09x =1586
is your starting point
