Answer:
Proportion of total delivered on time is 70% or 7/10
Step-by-step explanation:
Here, we want to know the proportion of all the packages delivered on time.
Moving away from the percentage, let’s say the total produced package amongst the 3 is 100
So;
Service A has 60% which is 60
Service B has 30% which is 30
Service C has 10% which is 10
Now from here, we move as follows;
on time rate for service A is 80%
This means 80/100 of the 60 is delivered on time
That will be 80/100 * 60 = 48
For service B, 60% is delivered on time; Thus we have ;
60/100 * 30 = 1800/100 = 18
For service C , 40% of 10
40/100 * 10 = 4
So the total on time delivery will be;
18 + 4+ 48 = 70
So the proportion delivered on time will be 70/100 = 7/10 or 70%