公式不适用于点击器游戏

Question

 const buydankMiner1 = () => {

  if (borkCoins >= dankMiner.cost) {
dankMiner.qt += 1;
borkCoins -= dankMiner.cost;
  dankMiner.cost = Math.floor(Math.pow(dankMiner.cost, 1.05) / 1.18); 
 displayScreen()
} else {
  alert("Insufficient funds!");
}
};

  const buydankMiner5 = () => {

  if (borkCoins >= dankMiner.cost * 5) {
dankMiner.qt += 5;
borkCoins -= dankMiner.cost * 5;
 dankMiner.cost = Math.floor(Math.pow(dankMiner.cost * 5, 1.05) / 1.18); 
 displayScreen();
} else {
  alert("Insufficient funds!");
}
};

The code above is from a clicker game I'm attempting to make. There are two buttons that either buy 1 "dankMiner" or five of it. What I tried to do was increase the cost of a said "dankMiner" each time it is bought, hence the formula that first raises it to the power of 1.05 and divides it to 1.18. It works when I buy one "dankMiner," however when I do the option of buying five of it, the cost of it is not the same as when I click on the buy 1 option five times.

For example, clicking on the buy 1 option fifteen times results to the next one costing 77. However, clicking the buy 5 option three times results to the next one costing over 11,000.

Answer 1

These two are different

Math.pow(something * 5, 1.05) / 1.18
Math.pow(something, 1.05) * 5 / 1.18

and also doing five time Math.pow(something, 1.05)/1,18 each time on the result of the precedent one. This latter is the one you need to implement for your purpose I think.