Question

Minta tolong dibantu mengerjakan yah _/\_​

Answer 1

Verified answer

Jawaban:

A. Rp. 85.050.000

Penjelasan dengan langkah-langkah:

Dik :

• Un = 31
• b¹ = 3
• b² = 4
• b³ = 5
• Σ¹ = 20
• Σ² = 30
• Σ³ = 50
• Uang per hari = Rp. 105.000

Dit : Biaya total bulan Oktober = .... ?

Jawab

Un = a+(n¹-1)b¹

31 = 1 + (n¹-1)3

31 = 1 +3n¹-3

31 = 1-3+3n¹

31 = -2+3n¹

-3n¹ = -31-2

-3n¹ = -33

n¹ = -33/-3

n¹ = 11

Un = a+(n²-1)b²

31 = 3 + (n²-1)4

31 = 3 +4n²-4

31 = 3-4+3n²

31 = -1+3n²

-3n² = -31-1

-3n² = -32

n² = -32/-3

n² = 8

Un = a+(n³-1)b³

31 = 1 + (n³-1)5

31 = 1 +5n³-5

31 = 1-5+5n³

31 = -4+5n³

-5n³ = -31-4

-5n³ = -35

n³ = -35/-5

n³ = 7

Biaya Total bulan Oktober

= (n¹ x Σ¹ x Uang per hari)+(n² x Σ² x Uang per hari)+(n³ x Σ³ x Uang per hari)

= (11x20x105.000)+(8x30x105.000)+(7x50x105.000)

= 23.100.000+25.200.000+36.750.000

= 85.050.000