Input Calculator in Banking App

A calculator-integrated input field in banking app.

I have been using the saving rule of 20-percent for a while. For every amount earnt, I want to tranfer 20 percent to a saving account. Having to switch to a calculator app whenever I want to do that, I want to integrate a quick form of calculating into the input field. This pattern is inspired by how smart inputs are being used in iOS, Google Search and CSS calculator. Would love to validate the use of this pattern further.

Transfer screen was inspired by ING Banking app, with modification and a change of branding colour.

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Ryan