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Question 1  the percent of sales tax is 6%. What is the sales tax on a stakeboard that costs $98 ?

 

Question 2   the price of your favorite brand of jeans was $28 last month. This month the price is $35. What is the percent of change from last month to this month?

 

 

Question 3  How long will it take $500 to double at a simple interest rate of 5% ?

Nerd123  Jan 30, 2018
 #1
avatar+92596 
+1

1. Sales Tax  =  Just multiply   98  by  .06

 

2.  Pct Change   =    

 

[  (  New Price  -  Old Price )  / Old Price  x 100 ]  %  =

 

[  (35 - 28) / 28   x  100 ] %  =

 

[ 7 / 28  x 100 ] %  =

 

[ 1/4 x 100 ] %   =

 

25%

 

 

3.    We want to find this

 

1000  = 500 * .05 * t      simplify

 

1000   =  25 * t            divide both sides by 25

 

40  = t  =   40 years  

 

BTW..... surprising fact....the time to double any amount at 5% would be the same  !!

 

 

 

cool cool cool

CPhill  Jan 30, 2018
 #2
avatar+229 
+1

Thank you Cphill

Nerd123  Jan 30, 2018

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