title: Perform calculation (label)
body: <p>I am new in coding and i need some of guidance and help from you guys here. I am creating a car rental system. When user click one of car in the list, it will be stored in session(the price). Then they need to select the rental days(in drop down list) and chauffeur service (select yes or no). Lets say 1 day the rental fee is <strong>$30.</strong> Then day of rental is <strong>3</strong> days and chauffeur service is <strong>$15</strong>. So the calculation will be <strong>$30</strong> x <strong>3</strong> = <strong>$90</strong> + <strong>$15</strong> = <strong>$105</strong>. The problem now, how to write in code all the calculation. All the bold numbers I write in label. Sorry for my bad English. Many thanks.</p>