No 22, 23, 24 beserta pembahasannya trims

22. U1 = 80
U5 = 5
r^4= 5
r^0= 80
r^4= 1/16
r= 1/2
U3= a.r^2
= 80. (1/2)^2
= 80. 1/4
= 20
jadi U3 = 20 (D)