I have a simple question ... I would like to solve using formulas on paper because the result I found using the hp 12c.

data

Funding Amount - $ 15,000.00

Value of shares - R $ 1.400,00

Number of months - 12 months

The interest will be:??

Answer: 1.7881%

I was using this formula: PV= (1 - (1+i)^n / i) . p

available on this link https://www3.bcb.gov.br/CALCIDADAO/publ ... acoesFixas

Thanks