Several ways are available for displaying multiple totals. You may display subsection totals as well as use a shortcode to supply the calculator total anywhere else on the site/page.
Comparing two scenarios with two different calculators on the same page with the totals next to each other.
Comparing two products/services by having two different calculators on the same page with the totals next to each other.
Have one calculator show the monthly price and the other show the yearly price.