Exactly 1.5g of soil is saturated with 100 ml of 1 m kcl. at the end of the saturation, the solution is analyzed, and the following results obtained: ca = 0.50 mg/l; mg = 1 mg/l; na = 1.5mg/l; al = 2 mg/l. if this represent all of the exchangeable ions that were initially on the soil, what is the cec and base saturation in men/100g?