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The math problem is urgent! ! ! ! ! ! ! ! ! ! ! There are two ways to charge a mobile phone in the table below:
(1) Mode1:15+0.05x80 =19 (yuan) Mode 2: 0.2x80 = 16 (yuan) Second economic benefit.

(2) mode1:15+0.05x120 = 23 (yuan) mode 2: 0.2x 120 = 24 (yuan) cost performance first.

(3) 100 minutes, the two methods are the same. Less than 100 minutes, use1; More than 100 minutes, use method 2.

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