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Solutions To ---

(a) Percentage Increase in the Price of Soap

= [($25 - $0.30) / $0.30] x 100%

= 2470 / 30 x 100%

= 82 x 100%

= 8233 %

(b) Percentage Increase in the Price of 500 g of rice

= [($75 - $1.50)] / $1.50] x 100%

= 7350 / 150 x 100%

= 49 x 100%

= 4900%

(c) Percentage Increase in the Price of a Ball-point Pen

= [($150 - $2) / $2] x 100%

= 148 / 2 x 100%

= 74 x 100%

= 7400%

(d) Percentage Increase in the Price of 1 kg of Potatoes

= [($95 - $6) / $6] x 100%

= 89 / 6 x 100%

= 14 x 100%

= 1483 %

(a) Cost Price of the Refrigerator

= x $870

= $725

(b) Commission received

= x $870

= $17.40

(c) (i) Amount of money to be paid each month

= [ x ($870 - $86)] / 8

= ( x $784) / 8

= $807.52 / 8

= $100.94

    (ii) Amount of money paid if paying all at once

= $( x $870)

= $826.50

         Amount of money paid if paying in the hire purchase scheme

= $(807.52 + 86)

= $893.52

(a) Ratio in which they invested their money in the company

= Bill         : Ben            : Buck

= 960 000 : 1 080 000 : 1 320 000

= 8             : 9               : 11

     Amount of money Ben received

=  x ( x S$2 100 000)

=  x S$840 000

= S$270 000

(b) Buck received 3 more parts of the money than Bill.Thus,

Amount of Money Buck received more than Bill

= x S$840 000

= S$90 000

(c) (i) Amount of Money Saved after 2 years

= S${ x[ x 70%( x 840 000)]}

= S$[ x( x 330 000)]

= S$( x 115 500)

= S$127 050

     (ii) Amount of US$ Buck had

= ( x S$330 000) x US$

= S$214 500 x US$

= US$130 000