Cutegirlcalabaviz
Answered

The amount of postage placed on a first-class letter depends on the weight of the letter ?

Sagot :

Cheahjimmyviz
the required expression is             P  is directly proportional to W
 thus       P = kw           P = amount of postage  k=constant &  w = weight 
 let do an example
    @ 20p/gm    >    for 1gm            P = 20*1 =    20p
                               for 3gm            P = 20* 3 =    60p     and so on