Ruby on Rails: how do I format money for my view? [duplicate]

This question already has answers here: 开发者_开发百科 What is the best method of handling currency/money? (13 answers) Closed 8 years ago.

This is what I have so far.

how do I ensure that i'll have two decimals? and that it rounds correctly?

$<%=h sale_item.value %>

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Think this covers it: What is the best method of handling currency/money?.