Startup Idea : See what $$ can buy you around the world, & donate

See what $10, for example, can buy you in the US (for example, 4 cups of coffee), Italy, France, and Africa (100 gallons of water, medicine for 50 people), and donate this money if you want to an organization of your choice. I can design and develop this website in static HTML, I need 1-2 developers to help me make this thing a reality. Obviously, it isn't for profit, just to make the world a slightly better place :)