Flex grow Wrapping

Width: 100%

For 1 Column Structure always use 100% for the inner container

Width: 35%

For 2 Columns Structure always use 35% for the inner container and give them Flex Grow. 
Also give the covered container Flex Wrap

Width: 25%

For 3 Columns Structure always use 25% for the inner container and give them Flex Grow.
Also give the covered container Flex Wrap

Width: 20%

For 4 Columns Structure always use 20% for the inner container and give them Flex Grow.
Also give the covered container Flex Wrap

Width: 16.5%

For 5 Columns Structure always use 16.5% for the inner container and give them Flex Grow.
Also give the covered container Flex Wrap

Width: 13.5%

For 6 Columns Structure always use 13.5% for the inner container and give them Flex Grow.
Also give the covered container Flex Wrap

Method is Below

1/1

1/2

1/2

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1/5

1/5

1/5

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1/5

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1/6

1/6

Example Below

Hourly Classes - $120

Hourly Classes - $120

Hourly Classes - $120

Hourly Classes - $120

Hourly Classes - $120