Page 30 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

Example 3
Out of 80000 cars, which were tested on road, only 16000 cars had no fault. What is the percentage in this
acceptance.

160000 100
= × 100 = = 20%
80000 5

Example 4 100 1800000

=
Original

Price =
18000 ×
The price of a motor cycle dropped to 92% of original price and now sold at Rs.18000/- What was the original
92
92
price.
Solution litres

(100 −
100
90)
= 160000
× 100
Present price of Motor cycle Rs.18000
×
100
=
100=
=
20%
5
80000
This is the value of 92% of original price
10
= × 100
100 100 1800000
Original Price = 18000 × =
92 92

= Rs. 19565160000 100
= × litres= = 20%
100
90)
(100 −
=
5
Example 5 80000 × 100
100
A Motor vehicle uses 100 litres of Petrol per day when travelling at 30 kmph. After top overhauling the consumption

falls to 90 litres per day. Calculate percentage of saving.
10
1800000
100
×

Orig
×
=
=inal
100 18000e =
Pric
Solution 100 92 92
Percentage of saving = Decrease in consumption/Original consumption x 100
litres
= (100 − 90) × 100
100
10
= × 100
100
= 10 % Saving in fuel.
Assignment
1 a = 400mm (side of square)
d = 400 mm
Wastage = ______ %.
2 d = 26mm
‘a’ depth of u/cut =
2.4mm
reduction of area at
cross-section
= ______ %
17

CITS : WCS - Electrical - Exercise 3