Each week a certain salesman is paid a fixed amount equal to $300, plus a commission equal to 5% of his sales that week over $1000. What is the total amount the salesman was paid last week?
1. The total amount the salesman was paid last week is equal to 10% of the amount of his sales last week
2. The salesman's sales last week totaled $5000
So I automatically know that 2 is sufficient. The OA is D, but I don't understand why 1 is sufficient.
You don't know anything about his sales this week or last week unless you incorporate #2, which is already sufficient.
from 1 : You know that sales person has earned 10% of all the sales
300+5%(x-1000) = 10% x
and calculate the calculate the value of X and we can get the amount that he earned