Interzone

If I have a 1-7 interzone passage from Haverhill and must get off at Malden (Zone 1A), what should I pay? Is this just the price of the zone 1 to zone 1A?

rates Interzone "and password are not valid for travel to or from North Station, South Station, Back Bay Station and other Zone 1A stations.". Uh-huh .. If I read correctly the site (if can be a big word) of four other males in each direction, on top of your card. It's clear as mud!