Grandpa's Gift Giving

Grandpa coded the value of his Christmas presents by wrapping paper. Presents in the same wrapping paper have the same value. His grandkids can pick the presents they want so long as they all receive an equal value of gifts according to the exchange rate table below. Complete the exchange rate table by finding the values for A and B and plug them into the promo code "ABGifts". The promo code can be used for 10% off a puzzle room experience and is valid until January 1, 2024.