Correct Answer - Option 2 : 1560

**Calculation:**

In 2019:

Let the students who appeared in exam P and Students who appeared in exam Q be 7z and 9z.

Students who appeared in exam R = 125% of 9z

⇒ 11.25z

∴ 7z + 9z + 11.25z = 4360

⇒ 27.25z = 4360

⇒ z = 160

∴ students who appeared in exam P = 1120

∴ students who appeared in exam Q = 1440

∴ students who appeared in exam R = 1800

In 2020:

Students who appeared in exam P = 1200/5 × 4

⇒ 960

Students who appeared in exam Q = 1120 × 2 - 960

⇒ 1280

Students who appeared in exam R = 1200

∴ Total students who appeared = 960 + 1280 + 1200

⇒ 3440

∴ Number of students cleared exam = 10% of 1120 + 20% of 1440 + 20% of 1800 + 20% of 960 + 10% of 1280 + 40% of 1200

⇒ 112 + 288 + 360 + 192 + 128 + 480

⇒ 1560

**The students that cleared all three exams in these two years are 1560.**