please use R code thank you.

3 Calculate the sum j=1nrj, where r has been assigned the value 1.08, and compare with (1rn+1)/(1r), for n=10,20,30,40. Repeat for r=1.06. 4 Referring to the above question, use the quick formula to compute j=1nrj, for r=1.08, for all values of n between 1 and 100 . Store the 100 values in a vector