Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
 John anajeruhi bega lake wakati anainua uzito. Baada ya jeraha, uwezo wake wa kubana benchi unapungua kwa 80%. Baada ya mazoezi kidogo, anafanikiwa kuongeza uzito anaoweza kubana mara tatu. Ikiwa alianza na kubana benchi lenye uzito wa paundi 500, sasa ni uzito gani?


### Response:
 Alikuwa amepoteza paundi 500 * 0.8 = <<500*.8=400>>400 kutoka kwenye benchi lake.
Kwa hivyo, benchi lake lilishuka hadi 500 - 400 = <<500-400=100>>100 paundi.
Baada ya mazoezi, uzito wake uliongezeka hadi 100 * 3 = <<100*3=300>>300 paundi.