Design instant price quotation

I need a dynamic price quotation rendered for my website visitors. I want them to compose what they need, so they see a clear final price (without seeing individual prices). client would select: 1. Number of users= 3 2. Features (Option A, Option C) 3. Price is calculated as followed: Base price: 49usd Over 2 users: +5usd Option A: 25usd Option C: 35usd TOTAL PRICE= 49 + 5+ 25 + 35 = 114usd Please note, the design has to be sleek and fit in this template: [login to view URL]