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CHAPTER 1
A retailer is selling Kasio watches at the price of RM239 each. Calculate
Example 9
the price of a Kasio watch after a
(i) 17% discount in price,
OPERATION
1 . First calculate the discount.
2
3
9
%
=
2 . The discount is RM40.63. The discounted price is
–
3 . To calculate the price after a 28% increase, press
2
3
9
%
=
+
Therefore, the increased price is RM305.92.
Example 10
Show that
OPERATION
1 . First, calculate
log
27
2
7
log
=
2 . Now calculate
log
405
log
4
0
Comparing the two results, it is therefore shown that
Verify that
15×
7
is equal to
Let's Get Started
X
1
7
X
2
8
+
is equal to
log
27
log
15
+
log
15
while calculator is in COMP mode.
+
1
log
×
=
27
15
405
, since
.
=
5
15 ×
7
. Also verify that
(ii) 28% increase in price.
SHIFT
239X17%
239X17%-
SHIFT
239X28%
239X28%+
×
.
log(
27
15
)
5
log 27+log 15
log 405
+
=
log
27
log
15
log(
3
5
5
3
=
4 (
)
4 (
)
.
40.63
198.37
66.92
305.92
2.607455023
2.607455023
×
27
15
)
.
5
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