Below Is Some Information Taken from the Income Statements of RPG

Below is some information taken from the income statements of RPG and RPM Co.
$\begin{array}{lrlr}\underline { \text {RPG Co. } }&\underline { 2015 }&\underline { 2014 }&\underline { 2013 }\\\text { Net Sales } &\$ 152,000 & {146,000} & \$ 140,000 \\\text { Cost of Goods Sold } &115,000 & 110,000 & 107,000 \\\text { GrossProfit } &\underline { \$ 37,000} &\underline { \$ 36,000}& \underline { \$ 33,000} \\\\A)\underline { \text { RPM Co.} }\\\text { Net Sales } &\$ 84,000 & \$ 83,000 & \$ 80,000 \\\text { Cost of GoodsSold } &70,000 & 69,000 & 68,000\\\text { GroseProfit } &\underline { \$ 14.000 }&\underline { \$ 14.000 }&\underline { \$ 12.000 }\end{array}$ A) Using time series (or trend) analyss, comment on the trend of RPG's cost of goods sold and gross profit.
B) Using cross sectional analysis, compare RPG's gross profit to that of RPM.