Pertanyaan :
Status : 100%
Keterangan : saya gunakan dengan baik dan benar
Business Mathematics 1 – Answers
1. Law Firm Salary Formula
Formula for the annual salary (S):
S = 1.2N + 3000E + 1000(A – 21)
(If A ≤ 21, the last part is usually considered as max(0, 1000(A-21))).
Example: If A = 30, E = 5, N = 150,000:
S = 1.2(150,000) + 3000(5) + 1000(30-21) = 180,000 + 15,000 + 9,000 = $204,000
2. Formula for Each Case
• Plumber: C = 80 + 60L + K (where L = labor hours, K = parts cost).
• Currency Exchange: C = 10 + 1.25x (where x = euros).
• Training: H = 5a + 10b (where a = semi-skilled, b = skilled).
• Car Hire: X = Cd + cm (where C = daily cost, c = per-mile cost, d = days, m = miles).
3. Mental Arithmetic (Group 1)
a) 10 × (-2) = -20
b) (-1) × (-3) = 3
c) (-8) ÷ 2 = -4
d) (-5) ÷ (-5) = 1
e) 24 ÷ (-2) = -12
f) (-10) × (-5) = 50
f*) (-6) × 5 × (-1) = 30
4. Mental Arithmetic (Group 2)
a) 5 – 6 = -1
b) -1 – 2 = -3
c) 6 – 17 = -11
d) -7 + 23 = 16
e) -7 – (-6) = -1
f) -4 – 9 = -13
g) 7 – (-4) = 11
h) -9 – (-9) = 0
i) 12 – 43 = -31
j) 2 + 6 – 10 = -2
5. Mental Arithmetic (Group 3)
a) 5 × 2 – 13 = -3
b) 5 × (1 – 4) = -15
c) 1 – 6 × 7 = -41
d) -5 + 6 ÷ 3 = -3
e) 2 × (-3)^2 = 18
f) -10 + 22 = 12
g) (-2)^2 – 5 × 6 + 1 = -25
6. Simplify Algebraic Expressions
a) 2 × P × Q = 2PQ
b) I × 8 = 8I
c) 3 × x × y = 3xy
d) 4 × q × w × z = 4qwz
e) b × b = b²
f) k × 3 × k = 3k²