Estimation is useful for tipping when you're dining out. If the service is good, $20\%$ of the overall bill is a nice tip to leave. Here's a clever way to find that: move the decimal of the total amount one place to the left: that gives you $10\%.$ Round this value to the nearest dollar and double the amount, and voilal Twenty percent. Use this to find a nice tip for good service on a bill of $$51\mathrm{.}48.$

A nice tip for good service on a bill of $$51\mathrm{.}48$ would be about $