Shouldn't it be "has" instead of "have"?

English as a Second Language English Vocabulary, Grammar and Idioms
1

The total amount of drugs seized have an estimated street value of S$173,000. The amount of Ice and cannabis seized can feed the addiction of about 580 abusers for a week.

Shouldn’t it be “has” instead of “have”?

Thanks.

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Yes, it should be ‘has’ as you say.
The subject ‘The total amount’ is the grammatical subject and it is singular.

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