Ishmael is a tenant of a home unit owned by Angela. Ten days ago Ishmael received a letter from Angela in which Angela stated that she was 'interested in selling' her flat and asked Ishmael to 'let her know' if he (Ishmael) was willing to buy the home unit for the price of $200,000. Three days later Ishmael posted a letter to Angela in which he agreed to buy the home unit for the price set out in Angela's letter. After receiving Ishmael's letter, Angela telephoned Ishmael and told him that she had decided that she did not want to sell the home unit. Also, Benjamin & Karen while visiting Joana & Bernice doing their national service in Koforidua decided to go shopping for groceries at the supermarket. In the shop, Karen sees a nice ladies bag she likes with a price tag of GH 200.00. Karen, therefore, picked up the bag and walked to the till to make payment. While at the till however, Karen was told that the price displayed on the item was not the same on the receipt at the checkout and that the price was actually higher than the price stated on the price tag. Karen was thus unhappy about the situation and insisted on paying the lower price stated on the price tag, but that was turned down by the supermarket operators. Advise Ishmael, Angela, and Karen as to their legal rights, if any