Tolong bantuan nya pke cara yg bnr terima kasih

diket=r1=24, r2=20, r3=30, r4=22
dit:rt=..?
jwb:1/rp=1/r2 + 1/r3
1/rp=1/20 + 1/30
1/rp=50/600
rp=600/50
rp=12
rt=r1 + rp + r4
rt=24 + 12 + 22
rt=58
maaf,kok gk ada ya...