During the first hour of operation the farm stand owner sold 15% of the apples he had. On the second hour he sold 20% of the remaining apples. On the third hour he sold 25% of the remaining apples, and so on, selling 5% more each following hour.b) If during the second hour 25.5 kg of apples were sold, how many kilograms of apples will be sold during the fourth hour of operation?

Answer:22.95 kgStep-by-step explanation:Let's say the farm stand owner starts with x kg of apples.During the first hour, he sells 15% of the apples:0.15 xThis means he's left with 85% of the original apples.  During the second hour, he sells 20% of the remaining apples:0.20 (0.85 x)= 0.17 xHe's sold a total of 15% + 17% = 32% of the apples, so he's left with 68% of the apples.  Continuing the pattern, the apples sold during the third hour:0.25 (0.68 x)= 0.17 xHe's sold 49% of the apples and is left with 51%.  The apples sold during the fourth hour:0.30 (0.51 x)= 0.153 xIf 0.17 x = 25.5, then x = 150.  So the apples sold during the fourth hour is:0.153 (150) = 22.95