Percent 
2.
The computer I need to buy costs $1,200.00. So far I have managed to save only 65% of the cost. How much more money will I need to make the purchase?
                    
Percent means out of 100. Therefore 65% is 65/100
                         
Money save so far is 65/100  X  1200   =   65 X 1200 
                                                                                                          100      
                                                                                                =  780
                                                                                   That is $780.00
If the computer costs $1,200.00 and I have only $780.00, I will need then

                                        
$1,200.00 - $780.00   =   $420.00

Percent
 
4. (i) What is 14% of 250?  (ii) 40% of what number is 30? (iii) 80 is what percent of 200?
       (i)
  14% is 14/100                    (ii)  Let the number be T                  (iii)  80/200) X 100
                (14/100) X 250                          40/100 of T = 30                               (8/20) X 100 = 800/20  
   
                     = 
35                                   40T = 30 X 100                                    = 40%
                                                            
T = (30 X 100) 40
                                                                                     = 3000 40

                                                                       =
75