60% of 30 =
                   ( 18 )

90% of 60 =
                   (       )

10% of 20 =
                   (       )

50% of 70 =
                   (       )

50% of 10 =
                   (       )

60% of 80 =
                   (       )

70% of 30 =
                   (       )

20% of 90 =
                   (       )

20% of 20 =
                   (       )

          +[         ]

50% of 50 =
                   ( 25 )

60% of 10 =
                   (       )

60% of 60 =
                   (       )

80% of 30 =
                   (       )

20% of 70 =
                   (       )

30% of 20 =
                   (       )

70% of 70 =
                   (       )

70% of 10 =
                   (       )

70% of 70 =
                   (       )

          +[         ]

90% of 30 =
                   ( 27 )

30% of 80 =
                   (       )

30% of 20 =
                   (       )

20% of 50 =
                   (       )

50% of 40 =
                   (       )

70% of 50 =
                   (       )

90% of 30 =
                   (       )

80% of 60 =
                   (       )

90% of 20 =
                   (       )

          +[         ]

       ++[[            ]]