package main

import (
    "fmt"
    "math"
)

func main() {
    price := int64(300 * 7)
    discountPercent := 95.19
    discount := discountPercent / 100.0
    amount := int64(math.Round(float64(price) * discount))
    fmt.Printf("price_cents=%d discount=%.4f amount_cents=%d amount=%.2f\n", price, discount, amount, float64(amount)/100.0)

    couponPercent := 10.0
    coupon := int64(math.Round(float64(amount) * (couponPercent / 100.0)))
    amount -= coupon
    fmt.Printf("coupon_percent=%.2f coupon_cents=%d amount_cents=%d amount=%.2f\n", couponPercent, coupon, amount, float64(amount)/100.0)

    feePercent := 5.0
    fee := int64(math.Round(float64(amount) * (feePercent / 100.0)))
    total := amount + fee
    fmt.Printf("fee_percent=%.2f fee_cents=%d total_cents=%d total=%.2f\n", feePercent, fee, total, float64(total)/100.0)
}