select concat('Cost range is ', min(cost), '-', max(cost)) from mail_cost mc join mail_areas ma on mc.zone = ma.zone where ma.area between 1 and 10 and mc.weight = 12;

##</code><code>##

zip      area
001    2
002    2
003    2
005    3
012    6
[...]

##</code><code>##

weight     area    cost
1              2          3.17
2              2          3.87
3              2          4.51
4              2          5.22
[...]
199            2         96.01
200            2         96.29
1              3          4.02
2              3          4.15
[...]

##</code><code>##


$areas = (
     '001' => 2,
     '002' => 2,
     '003' => 2,
     [...]
);