The price of a 1987 model Yamaha RX 100CC bike can vary depending on various factors such as the condition of the bike, its mileage, any modifications or restoration work done, and the demand in the market. Additionally, regional factors and the availability of this particular model in your area can also influence the price.
To get an accurate estimate of the selling price, I recommend checking online platforms or classified websites that specialize in buying and selling used motorcycles. You can also consult with local bike dealers or enthusiasts who have knowledge about vintage bikes to get an idea of the current market value for the Yamaha RX 100CC model from 1987.