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2 Answers

Adding all of their work together we get 4 hr + 3 hr + 1 hr = 8 hrs of work.
 
If the payment for 8 hrs of work is R400 then the payment per hour of work is R400 รท 8 = R50 per hr.
 
Phumelo then should receive 4 hr x R50/hr = R200
 
Ivan should receive 3 hr x R50/hr = R150
 
and John for 1 hour of work should receive R50
The students spent a total of:
 
4 hours + 3 hours + 1 hour = 8 hours on the job.
 
Phumelo worked 4 of the 8 hours so he should receive 4/8 of the $400:
 
Phumelo's Pay = (4/8)*($400) = ???
 
Ivan worked 3 of the 8 hours, and should get (3/8) of the pay:
 
Ivan's Pay = (3/8)*($400) = ???
 
John worked the remaining 1 of 8 hours.  How much of the $400 should he get?