3.In percentage terms, what is the approximate increase in participation from 2005 to 2008?

That depends on the number of participants in 2005.
If you don't give the full problem then we can't give you an answer.

That is an unsolveable question. You have to have a Non Zero Starting point in order to calculate a percentage of increase. Black is essentially 0. and no % increase of 0 will bring you anything but 0

If you want to find 25% of 500
ENTER....
500 X 25 [2ndF] % will display 125.

If you want to know what % a number is of another number like for instance...
What percentage is 120 of 400?
ENTER...
120 [DIV] 400 [2ndF] % will display 30.


If you want to increase a number by some percentage like
Increase 500 by 25%
ENTER...
500 + 25 [2ndF] % will display 625.

If you want to decrease a number by a percentage like
Decrease 400 by 30%
ENTER...
400 - 30 [2ndF] % will Display 280.

NOTE [2ndF] is the 2ndF button. Do not enter the brackets [ and ].
NOTE [DIV] is the divide button. The text editor would not let me enter the divide symbol

3=100%
26=A (the A is the percentage of the this year)
so we make 26*100=3*A
2600=3A
A=2600/3=866.67 (is the percentage of the this year)
and to know the percentage increase (we remove the percentage of the last year (100%) from the percentage of the this year 866.67%
so we get 866.67-100=766.67
so your percentage increase is 766.67%
i wish it helps

Divide a number by another
8.23/12=0.69
percentage=0.69*100%=69%
Each calculator has its way of calculating percentages, percentage increase/decrease.

To find what percentage one number is to another: get the lower number (34,790) multiply it 100, and divide by the higher number. (34790*100=3479000/47020 =73.99 when rounded two decimal points) , the second country stacks up against the first country in percentage terms is 73.99%. Hope this helps...I loathed economics!!!

There isn't a function for this, but the formula should be something like this:
A1: Number to increase / decrease
B1: % change
C1: 'INC' or 'DEC'
D1: =IF(C1='INC', A1+(A1*B1), A1-(A1-B1))

A percentage increase from a value a to a value b is defined as
Percent increase=(b-a)/a*100 percent.
In your case it is (200-70)/70=1.857. Multiply this number by 100 and append the percent symbol. Thus increase=185.7 percent or about 186 percent.