<PRE><B>Question 30032</B>
% of in crease and % of decrease follows a simple formula
{{{ (difference/original)* 100 }}}
Lets start with problem #3
{{{ ((25 - 10)/25) * 100 }}}
{{{ (15/25) * 100 }}}
{{{ (3/5) * 100 }}} or {{{ (6/10) * 100 }}}
{{{ 600/10 = 60/1 }}} or 60%
Problem #4
{{{ ((50 - 30)/30) * 100 }}}
{{{ ((20)/30) * 100 }}} or {{{ (2/3) * 100 }}}
2/3 = .6 repeating ........
66 2/3%
 Now for the first two:
1. What number increased by 30% = 260?
1x + .3x = 260 
1.3x = 260
x = 200
2. What is 66 2/3% less than 45? (66 2/3 % ... from prob #4 is 2/3)
1x = 45 - 2/3x
4/3x = 45
x = 33 3/4
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