Doubling coupons, do you use the same coupon or do you have to have two of them?

Some places will double your coupons . they generally advertise that they will for coupons up to a $1:00. No you do not need to use 2 coupons.Doubling coupons, do you use the same coupon or do you have to have two of them?
Doubling coupons means they double the value of the coupon, exclusions are usually free item coupons and usually the max value is $1.00, Some stores only double during special days or sales, watch the sale ads for doubling coupon events/Doubling coupons, do you use the same coupon or do you have to have two of them?
you use the same coupon and they double the discount a 50 cent coupon would save you a dollar, a 75cent coupon would save you a $1.50, and so on