$2.$ Parkers offers $10$ cents off a gallon for every $$25$ spent in the store up to $25$ gallons.

A cash back credit card offers $5\%$ back on gas purchases.

What would be the savings if an individual bought $25$ gallons of gas at $$3\mathrm{.}10$ a gallon with a cash back card?

What would be the savings from using the Parker rewards of $10$ cent off per gallon? Which is better? Explain.