answer with solution pls

Doknow Co. like to estimate the variable and fixed cost components of its maintenance cost and has compiled the following data for the last 6 months of operation: Answer the following. Show solutions. All answers in two decimal places. 1. Compute for the summation of XY. 2. Compute for the summation of X squared. 3. Using Hi-Lo method, what is the estimated fixed cost per month for maintenance