Need explanation of the attached file...........
1. The variable is the daily balance
2. The variable changes thrice i.e., it takes 4 values.
3. The average daily balance for the 30 days is given as 1000
Relevant topic: Weighted average. The clues for identifying this topic are the mention of arithmetic mean and the unequal days (i.e., the weights) for each value.
Solution:(10 *1000 + 5*650 + 5*150 + 10 * x )/ 30 = 1000
The deposit therefore is 1600-150=1450 ( because the balance was already 150 when the deposit was made and so has to be deducted to find the deposit)
Sravna Test Prep
Classroom Courses in Chennai
Online and Correspondence Courses