for that price (28) its very good. even more good if we pay only 20 now. he will be on 3.5 - 4 per year - aguero 7.5.
aguero will cost 40 + 7.5*5 = 77.5ME - KUN for 5 years.
Rossi 28 + 4*5 = 48ME - Rossi for 5 years.
Im sorry but the difference between them is not 30ME.
You need to add the taxes.
Aguero:
7.5m eur net = 12.9m eur gross (taxes are 42%)
12.9 x 5 = 64.5m eur for 5 year wages.
64.5 wages + 40 m transfer =
104.5m eur for Aguero
Rossi:
4m eur net = 6.9m eur gross
6.9 x 5 = 34.5 m eur
34.5 wages + 28 transfer =
62.5 m eur for Rossi
Difference = 42 million euro ( or 8.4m eur per year)