I know that the correct answer is (b) 3/4 but I cannot figure out how to get to that point. This is the Heckscher-Ohlin Model for International Trade economics

Instructions For all the following questions, we focus on Home and two industries, 1 and 2, and assume that the ratio of labor to capital used in industry 1 is equal to 10 divided by the relative wage (10 over W/ R), while the ratio of labor to capital used in industry 2 is equal to 2 divided by the relative wage (2 over W/R). This quiz was locked Mar 3 at 11:59pm. Attempt History Attempt Time Score LATEST Attempt 1 18 minutes 2 out of 7 Score for this quiz: 2 out of 7 Submitted Mar 3 at 11:03pm This attempt took 18 minutes. Question 1 0 I 1 Pts Imagine that the total supply of capital is 100 and the total supply of labor is 400, and that the relative price of labor to capital is 1 lie, W/R = 1). What is the share of capital employed in sector 2 so that the relative demand and relative supply of labor are equalized. You Answered Correct