Hi Vitali, Let me do a specific example: Let's say you want to increase the PC by 20% per year and on March 1 the PC is 100. To find out what the PC will be on March 20 you plug this into the formula: 1 + (March 20 - March 1)/365 * 20/100 =1 + 19/365 * .2 = 1+ 0.0104=1.0104 So PC on March 20 will be 100 * 1.0104 = 101.04 Adam