Since the new average of $400 represents a $150 increase from the previous average, the average commission on the previous sales = 400-150 = 250. This is a WEIGHTED AVERAGE/MIXTURE problem. Let P = previous sales and N = new sale. Average commission for P = 250. Commission for N = 1000. Average com...

The formula works. Just subtract the mean from each of the two new terms - add up the difference and divide by the total number of new terms. This will give you the change in mean. Then add it to the old mean to get the new mean. Basically what you are doing here is that, you are calculating how mu...

Hi, I am in similar dilemma. I have been an average commerce student. And its been 6 years since I gave any exam. Which also means all maths fundas look super new to me and grammar sounds latin. I have been scoring badly (just once I reached 500+, of my 3 mock tests). But, just a sider, I know I am ...

GMAT Preparation strategy for 1st timer

Hi, I am going to give GMAT for 1st time. I have exact 85 days of preparation (have already spent 2 weeks of preparation). I have got myself latest edition of MGMAT books. However, I want to know how should I plan my time more effectively to give my best shot. I would like to know: i. How many days ...