Find the cost of 100 grams at 95p per 1/2 kg

100 grams costs 95p;

1/2 kg = 500 grams;

500 grams costs 5·95 p = 475 p;

the first one, all those points on the line just make a strait line.

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.