For the Rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. For an 14 month period, the last term is
14
and the series sum is 105 4
For a 16 month period, the last term is
and the series sum is
For a 20 month period, the last term is
and the series sum is

look a the sides they are perpendicular

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540