Maths question help please?!

Hi, i've done parts A and B of this question, i just need to do part C and i've tried but I don't get it :(

5. A company assembles drills using components from two sources. Goodbuy supplies 85% of the components and Amart supplies the rest. It is known that 3% of the components supplied by Goodbuy are faulty and 6% if those supplied are Amart are faulty.
c) a customer orders three drills. Find the probability that at least 2 are faulty.

Thanks :)

(.03)*(.85) + (.06)*(.15)
**************************
........0.85+0.15

0.0345
********
.....1

0.0345

..345
********
10000

177
******.....ANSWER
5000

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