A product mix from butane

Butane has six primary and four secondary hydrogen atoms. A halogen can replace either kind. You will find the share of 2-halobutane in the product.

The idea. The weight of each kind of hydrogen is its number times its rate. The share of a product is its weight divided by the total weight.

Your tasks.

1. Set weight_primary to the weight of the primary hydrogen atoms.
2. Set weight_secondary to the weight of the secondary hydrogen atoms.
3. Set percent_2 to the percentage of 2-halobutane in the product.
4. Set ratio to how many times more 2-halobutane is made than 1-halobutane.