The finction needs to be simple only a few simple steps similiare to these maybe

gas per gallon $=3\mathrm{.}00$

# of gallons in cor's tank$=10$

Cars efficiency in miles per gallon $15$

function cost equals road trip parentheses car distance, gas, gallons, total miles, gas price,$)$

$\%$ totalCost is determined by dividing the total

distance by distance traveled on one tank multiplied by tank size and price per gallon.

Cost equals parentheses total miles divided by car distance parentheses times gas gallons times gas price;

Percent in order to round, we must multiply by $100,$ round, and then divide

cost $=$cost $*100$;

cost$=$ceil$($cost$)$;

cost$=$cost$/100$;