The percentage of price of mangoes was increased by 15% from November to January.
Step-by-step explanation:
Therefore, the change in percentage is percentage increase.
Percentage increase = (difference between two prices / lower price) × 100
⇒ (18-12 / 12) × 100
⇒ (6 / 12) × 100
⇒ 50 %
Therefore, the percentage change from November to January is increase of 50 %.