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Most of the Discover it® credit cards have at least general 1% cash back on all purchases and some cards will allow you to earn a 5% cash back in rotating categories. For instance, each quarter you can save up to $75 on purchases in such categories like gas, restaurants and movies. Three months a year you will be able to earn 5% cash back on gas purchases. Note that every quarter you will have to sign up to activate the bonus cash back offers.