Answer:
16/100 = 4/25
Step-by-step explanation:
The given are 10 ohms 20 ohms and 100 ohms.
The formula for getting the parallel circuit is 1/r1 + 1/r2 + 1/r3 (the denominators are the given)
Then we calculate, Rp=1/10+1/20+1/100=10/100+5/100+1/100=16/100