I'm not sure I understand what to do here, can anyone help me?

You will need this link https://phet.colorado.edu/sims/cheerpjuclear-physics/latestuclear-physics.html?simulation=alpha-decay

for reference :

10. Suppose a substance has a halflife of 0.52 s. Create accurate pie charts showing the number of remaining parent nuclei and decayed daughter nuclei (shade slightly) starting with 40 total nuclei. PREDICTION with VALUES: 20523 21043 21563 21083 11. Use the PhET alpha deca').r simulation to test your scenario copying each pie chart. _IMULATIDN ith VALUES: 20523 21043 21563 22.083 12. Hon.r does your prediction match the results of the simulation? Convey with actual values from the simulation and a calculation of percent difference on 0.52 seconds. Activity: Open/Run Alpha Decay at https://phet.colorado.edu/en/simulation/legacy/alpha-decay Take 10 minutes to freely explore the simulation. 1. Click to "Custom" from the column on the right of the screen and get the diagram below.Alpha Decay (3.371 Fila Hop Multiple Atoms Single Atom PLET Legend Nautan Proton # Pb Apha Particle Time (secs) Half Life Choose Nucleus Polonium-211 Reset All Nuclei Land- 207 Custom Rasat.All Bucket o' Polonium Add 10 # Bastat UNIT 3 DECTEXTY.. Experiment Cact.. Ahs Decay - Aphs... 4pha Decay [3.27) 2. Learn to adjust the half-life to any value you want between 0.5-1 second using double-sided green arrow.cilant- Incl-HI O 3. Learn to add atoms to the bucket by clicking "Add 10" icon below the bucket at the bottom and get the diagram below. h- 4. By clicking the" arrow "' button ("play" button} get how many undecayed atom remains in each trial, or count manually, those decayed {daughter nuclei) are in different color compared to those nuclei which are not decayed yet