Question

20. Ramkali saved + 5 in the first week of a year and then increased her weekly saving
+1.75. If in the nth week, her weekly savings become *20.75, find a
5.4 Sum of First n Terms of an AP
Let us consider the situation again
given in Section 5.1 in which Shakila
put * 100 into her daughter's money
box when she was one year old,
* 150 on her second birthday,
7200 on her third birthday and will
continue in the same way. How much
money will be collected in the money
box by the time her daughter is 21
years old?
Here, the amount of money in 7) put in the money box on her first second,
fourth ... birthday were respectively 100, 150, 200, 250, ... till her 21st birthda
find the total amount in the money box on her 21st birthday, we will have to write
of the 21 numbers in the list above and then add them up. Don't you think it wo
tedious and time consuming process? Can we make the process shorter? This​

Answer 1

Step-by-step explanation:

sry this is too long to answer you can refer your teacher for this