Amenys earns $35.00 after taxes, so Esinam earns 3 * $35.00 = $105.00 after taxes.
Amenys earns $35.00 after taxes per month, so after 5 years he earns 5 * 12 months/year * $35.00/month = $2100.00
Esinam earns $105.00 after taxes per month, so after 5 years he earns 5 * 12 months/year * $105.00/month = $6300.00
Together, their income after 5 years is $2100.00 + $6300.00 = $8400.00.