add taxes

src/market/tax/TaxInput.vue

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+<script setup lang="ts">
+import { storeToRefs } from "pinia";
+import { useMarketTaxStore } from "./tax";
+
+const { brokerFee, scc } = storeToRefs(useMarketTaxStore());
+
+</script>
+
+<template>
+    <div class="end">
+        <span>Broker Fee: </span>
+        <input type="number" min="1" max="3" step="0.01" v-model="brokerFee" />
+    </div>
+    <div class="end">
+        <span>SCC: </span>
+        <input type="number" min="3.6" max="8" step="0.01" v-model="scc" >
+    </div>
+</template>
+
+<style scoped lang="postcss">
+div.end {
+    @apply justify-self-end ms-2;
+}
+</style>

src/market/tax/index.ts

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+export * from './tax';
+
+export { default as TaxInput } from './TaxInput.vue';
+

src/market/tax/tax.ts

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+import { useLocalStorage } from "@vueuse/core";
+import { defineStore } from "pinia";
+
+export const useMarketTaxStore = defineStore("marketTax", () => {
+    const brokerFee = useLocalStorage("market-brokerFee", 1.5);
+    const scc = useLocalStorage("market-scc", 3.6);
+
+    const applyTaxes = (price: number, sellOrder?: boolean) => sellOrder ? price * (1 - (brokerFee.value + scc.value) / 100) : price * (1 + brokerFee.value / 100);
+    const calculateProfit = (buy: number, sell: number) => (applyTaxes(sell, true) / applyTaxes(buy)) - 1;
+    
+    return { brokerFee, scc, applyTaxes, calculateProfit };
+});