You would do percent of change.
meaning you would subract 65 and 50 to get 15. then you would put 15 over 50 (as a fraction) then equals r/100. then you would cross multiply to get r.
orginal:50
new:65
65-50=15
15/50=r/100
15r=5000
then divide by 15 to get r
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Hi, all we need to do is to divide the amount of total dog food by the amount that dog eats every day and we will get the number of days the dog food will last.
128/8 = 16 days
20x(5/100)=1
That is the interest after one year
Add to the principal:20+1=21
