Jim takes at random a counter from the bag. The probability that the counter is red is 0.45
Jim puts the counter back in the bag.
Molly takes at random a counter from the bag.
She puts the counter back in the bag.

a) What is the probability that Jim and Molly take counters of different colours?
Give your answer as a decimal.
(2)

There are 81 red counters in the bag.
b) How many blue counters are there in the bag?
(2)
Total marks: 4