6 helppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp

Answer: 25% of 60 is 15, 10% of 40 is 4, 12% of 450 is 54, and 20% of 225 is 45.
So a is 15, b is 4, d is 450, and c is 225.