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Mr. Jackson invested $800 at 6% per year and $ 2400  at 4 % per year 
<h3><u>Solution:</u></h3>
Mr. Jackson invested a sum of money at 6% per year, and 3 times as much at 4% per year.
Let the sum invested be ‘a’ and ‘3a’ at 6% per year and 4 % per year respectively
Also, his annual return totaled $144
We can form following equation on the basis of question:-

a = $800
The amount of money invested at 6% = a = 800
The amount of money invested at 4 % = 3a = 3(800) = 2400
So, the amount of money invested at 6% is $800 and the amount of money invested at 4% is $ 2400
 
        
             
        
        
        
42.8% players practised more than one time a week
Step-by-step explanation:
Total no of players practising = 7
Players who practice more than once a week= 3
(According to graph player no 1,3 and 5 played more than once in a week)
To find the percentage of the players who practised more than one time a week
The formula used is:
 percentage of players practising more than one time a week=  ( no of player playing more than once / total no of players ) x 100%
Putting values in the formula
 percentage of players playing more than one time a week=  %
%
                                                                                        =  %
%
                                                                                        = 42.8%
So, 42.8% players practised more than one time a week
Keywords:  Calculation of percentage
Learn more about calculation of percentage at
#learnwithBrainly
 
        
             
        
        
        
Answer:
77.28
Step-by-step explanation: