26. A school conducted checks on its Primary 1 pupils' eyesight from Monday to Thursday. Each of them had their eyes checked on one of the four days. The bar graph below shows the number of pupils that were checked on each day.
Y-axis: Number of pupils (intervals of 20 and scale from 0 to 200)
X-axis: Monday, Tuesday, Wednesday and Thursday
All columns in the graph are shaded.
What percentage of the Primary 1 pupils had their eyes checked on Monday?
180 + 120 + 200 + 100 = 600
180/600 x 100% = 30%