Update exercises/cut_off.py

Replaced text input with Radio buttons for Question 3

exercises/cut_off.py

@@ -135,8 +135,10 @@ def cut_off():
   st.markdown("## Question 3: Sensitivities")
   st.write("")
   st.markdown("### By Adjusting the various input parameters given below, comment on the following:")
-  st.text_area("1. What copper price results in a revenue which is double the break-even cut-off grade", height=5, key='tt1')
-  st.text_area("2. What copper grade results in a revenue which is double the break-even cut-off grade", height=5, key='tt2')
+  # st.text_area("1. What copper price results in a revenue which is double the break-even cut-off grade", height=5, key='tt1')
+  st.radio("1. What copper price results in a revenue which is double the break-even cut-off grade", ['$3.25', '$2.00', '$9.00', '$7.50'], key='tt1')
+  # st.text_area("2. What copper grade results in a revenue which is double the break-even cut-off grade", height=5, key='tt2')
+  st.radio("2. What copper grade results in a revenue which is double the break-even cut-off grade", ['0.2%', '0.9%', '2.4%', '4.0%'], key='tt2')
   st.write("")
   adjust_calculation(df.copy())