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