4
5
8
10
Correct answer is D
8x-2 = 2/25
x-2 = 2/25 x 1/8
x-2 = 2/200
x-2 = 1/100
1/x2 = 1/100
x2 = 100
x = 10
If log7.5 = 0.8751, evaluate 2 log75 + log750
6.6252
6.6253
66.252
66.253
Correct answer is B
If log 7.5 = 0.8751
Then 2log75 + log750
= 2(1.8751) + 2.8751
= 3.7502 + 2.8751
= 6.6253
N40,500
N45,000
N52,500
N62,000
Correct answer is B
Let;
M = Man monthly net earnings
Then;
\(\text{N4500} = \frac{\text{10%}}{\text{100%}} \times M \)
\(M = \frac{\text{N4500} \times \text{100%}}{\text{10%}} \)
M = N45,000
Express the product of 0.00043 and 2000 in standard form.
8.6 x 10-3
8.3 x 10-2
8.6 x 10-1
8.6 x 10
Correct answer is C
0.00043 x 2000
= 43 x 10-5 x 2 x 103
= 43 x 2 x 10-5+3
= 86 x 10-2
= 8.6 x 101 x 10-2
= 8.6 x 10-1
A woman bought a grinder for N60,000. She sold it at a loss of 15%. How much did she sell it?
N53,000
N52,000
N51,000
N50,000
Correct answer is C
SP = Nx
CP = N60,000
Percentage loss = 15%
Using percentage loss...
\(\frac{CP - SP}{CP} = \text{100%}\)
\(\text{15%} = \frac{60000 - x}{60000} \times \text{100%}\)
\(\text{15%} \times 60000 = (60000 - x)\text{100%}\)
\(60000 - x = \frac{\text{15%} \times 60000}{\text{100%}}\)
60000 - x = 3 x 3000
60000 -x = 9000
x = 60000 - 9000
x = N51,000