Easy-looking math sum leaves people scratching their heads - can you remember the special rule?

A brain teaser shared online this week has left people stumped. Can you remember the special rule taught in math class to figure out the correct answer?

Restaurant Surcharges Could Make Your Credit Card Rewards Pointless

With Neighborhood Nosh, you can earn 3%, 5% or 10% cash back depending on your membership level. With Rakuten Dining, you can ...