Extra event registration costs

When customizing an event registration form, there are two field types (multiple choice with extra cost and radio buttons with extra cost) which have amount fields for each option. Depending on the selected options, appropriate amounts are added to the total event registration fee to be paid.

In the example below, the base event fee is $100 for non-members (public) plus the optional tennis activity has been selected ($50) and meal choice is steak ($10), which brings the total registration fee to $160: