George used the diagram below to help determine 30% of 60. Which expression could George have used?

30% of 60
10%
10%
10%
10%
10%
10%
10%
10%
10%
10%
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
6
6
6
6
6
6
6
6
6
6

(0.10)(6)
(0.10)(60)
(3)(6)
(3)(60)