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Задание 1 (выгодность):
=15000/(1+9%*136/365)+16000/(1+9%*243/365)+17000/(1+9%*346/365)+18000/(1+9%*481/365)-60000

Задание 2a (PV):
=150000/(1+9%)^1+150000/(1+9%)^2+250000/(1+9%)^3+250000/(1+9%)^4

Задание 2a (FV):
=150000*(1+9%)^3+150000*(1+9%)^2+250000*(1+9%)^1+250000

Задание 2b (PV):
=150000/(1+9%)^1+400000/(1+9%)^2+400000/(1+9%)^3+250000/(1+9%)^4

Задание 2b (FV):
=150000*(1+9%)^3+400000*(1+9%)^2+400000*(1+9%)^1+250000

Задание 2c (реальная ставка):
=(1+9%)/(1+3.2%)-1