hi, can anyone help me how they solve this question step by step. this is finance subject, calculation variance in rates in return. thank you!

- o = (-10% 14%){(0.10) + (5% 14%)?(0.20)], + (15% 14%)?(0.40) + (25% 14%)?(0.20) + (30% 14%)?(0.10) V 124% 11.14%