3. The Plasticity Index (PI) and the Liquid Limit (LL) are soil properties used in the AASHTO soil classification system. Figure 15.3 below shows how depending on the PI and LL values, soils could fall into different categories. For example: a. for PI = 50 and LL = 50, the soil would be classified as A-7-6 b. for PI = 5 and LL = 50, the soil would be classified as A-5 or A-2-5 (where two categories are listed the soil could be either one, so include both) c. and so on, depending on the area where a point of coordinates LL, PI lands

Using visual basic (VBA) develop an application where users can enter values for PI and LL and the application will automatically find the AASHTO soil category as described in Figure 15.3. If the point is exactly on a border line between different areas it is ok if only one of the areas is identified and it does not matter which one. The program should work for any possible combination of LL and PI values. Submit this application online in the Homework and Exam folder. Dont forget to sign it and make it unique.