Draw a straight line that follows the scatterplot - either by guesstimating (best choice) or by applying any known method to extrapolate a line. Then it's just a matter of reading the y value corresponding to that x. Hardly a perfect image, but close enough since it's a prediction
To get the result we have to find 20% of 22.58. First we have convert 20% into decimal. 20% its 0.20 Finally we can multiply 0.2 and 22.58. 0.2*22.58=4.516 - its the answer