✔ 最佳答案
Last year:
Total expense = $5000
Renting a venue: $5000 × 60% = $3000
Buying souvenirs: $5000 - $3000 = $2000
This year:
Renting a venue: $3000 × (1 + 5%) = $3150
Buying souvenirs: $2000 × (1 - 10%) = $1800
Total expense = $3150 + $1800 = $4950
Percentage change
= (4950 - 5000)/5000 × 100%
= -1%