Sue wants to increase 160 by 4% She writes down

160 x 1.4 = 224

Sue's method is wrong.

a) Instead of multiplying by 1.4, write down

what she should have multiplied by

Bill wants to decrease 160 by 6%

b) Complete the statement below to show how Bill can decrease 160 by 6%

160 × ___ =___

see explanation

Step-by-step explanation:

An increase of 4% = 104% = = 1.04

Sue should have multiplied by 1.04

(b)

A decrease of 6% = 94% = = 0.94 , thus

160 × 0.94 = 150.4

Step-by-step explanation:

NOTE: Increasing x by p% means multiplying x by (1+p%).

then

increase 160 by 4% means multiply 160 by (1+4%)

in other words:

1+0.04 = 1.04

increase 160 by 4% means 160 by 1.04

160×1.04 = 166.4